Power Windows Malfunction (All Windows Express Up/Down)
| Power Windows Malfunction (All Windows Express Up/Down) |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
has overviews of all diagnostic categories.
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| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Driver Window Motor B+
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U1530 00, U1534 00
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U1530 00
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-
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-
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Left Rear Window Motor B+
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U1530 00, U1534 00
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U1534 00
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-
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-
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Right Rear Window Motor B+
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U1530 00, U1534 00
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U1534 00
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-
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-
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Passenger Window Motor B+
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U1530 00, U1534 00
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U1530 00
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-
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-
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Driver Window Motor Serial Data
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U1530 00, U1534 00
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U1534 00
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U1534 00
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-
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Left Rear Window Motor Serial Data
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U1530 00, U1534 00
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U1534 00
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U1534 00
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-
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Right Rear Window Motor Serial Data
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U1530 00, U1534 00
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U1534 00
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U1534 00
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-
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Passenger Window Motor Serial Data
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U1530 00, U1534 00
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U1534 00
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U1534 00
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-
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Driver Window Motor Down Signal
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B316B 02
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1
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1
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-
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Driver Window Motor Express Signal
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B316B 02
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1
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1
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-
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Driver Window Motor Up Signal
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B316B 02
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1
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1
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-
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Left Rear Window Motor Down Signal
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B318B 02
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3
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3
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-
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Left Rear Window Motor Express Signal
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B318B 02
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3
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3
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-
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Left Rear Window Motor Up Signal
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B318B 02
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3
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3
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-
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Right Rear Window Motor Down Signal
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B319B 02
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4
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4
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-
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Right Rear Window Motor Express Signal
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B319B 02
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4
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4
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-
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Right Rear Window Motor Up Signal
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B319B 02
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4
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4
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-
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Passenger Window Motor Down Signal
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B317A 02
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2
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1
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-
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Passenger Window Motor Express Signal
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B317A 02
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2
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1
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-
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Passenger Window Motor Up Signal
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B317A 02
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2
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1
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-
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Driver Window Motor Ground
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-
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U1534 00
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-
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-
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Left Rear Window Motor Ground
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-
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U1530 00
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-
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-
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Right Rear Window Motor Ground
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-
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U1530 00
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-
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-
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Passenger Window Motor Ground
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-
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U1534 00
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-
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-
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Driver Window Switch Ground
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-
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1, 2, 3, 4
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-
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-
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Left Rear Window Switch Ground
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-
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3
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-
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-
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Right Rear Window Switch Ground
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-
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4
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-
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-
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Passenger Window Switch Ground
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-
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2
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-
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-
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1. Driver Window Malfunction
2. Passenger Window Malfunction 3. Left Rear Window Malfunction 4. Right Rear Window Malfunction |
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| Circuit/System Description |
The window motors are supplied with B+ voltage which is used to power the motor and also used as a reference voltage within the logic circuit. When the driver or passenger window switch is actuated, a switch closes, causing the reference voltage in that window motor circuit to drop. The window motor responds by moving the window in the required direction.
| Reference Information |
Schematic Reference
Moveable Window Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for information on diagnostic tools
| Circuit/System Verification |
| 1. |
Ignition ON, command the driver window UP and DOWN with a scan tool. The driver window should perform the UP, DOWN functions.
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| 2. |
If the driver window does not perform as specified, refer to Window Motor Malfunction.
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| 3. |
Command the passenger window UP and DOWN with a scan tool. The passenger window should perform the UP, DOWN functions.
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| 4. |
If the passenger window does not perform as specified, refer to Window Motor Malfunction.
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| 5. |
Command the left rear window UP and DOWN with a scan tool. The left rear window should perform the UP, DOWN functions.
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| 6. |
If the left rear window does not perform as specified, refer to Window Motor Malfunction.
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| 7. |
Command the right rear window UP and DOWN with a scan tool. The right rear window should perform the UP, DOWN functions.
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| 8. |
If the right rear window does not perform as specified, refer to Window Motor Malfunction.
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| 9. |
Command the driver window regulator UP, DOWN, express UP and express DOWN by using the S79D Window Switch-Driver. The driver window motor should carry out the UP, DOWN and express functions.
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| 10. |
If the driver window does perform as specified, refer to Driver Window Switch Malfunction.
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| 11. |
Command the passenger window regulator UP, DOWN, express UP and express DOWN by using the passenger window switch and the current front switch on the S79D Window Switch-Driver. The passenger window motor should carry out the UP, DOWN and express functions for each switch.
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| 12. |
If the passenger window does not perform as specified, refer to Passenger Window Switch Malfunction.
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| 13. |
Command the rear left and rear right window regulator UP, DOWN, express UP and express DOWN by using the rear left and rear right switches on the S79D Window Switch-Driver. Both rear windows should carry out the UP and DOWN functions from each switch.
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| 14. |
If a rear window does not perform as specified, refer to Driver Rear Window Switch Malfunction.
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| 15. |
Command the left rear window UP, DOWN, express UP and express DOWN by using the S79LR window switch-left rear. The left rear window should perform the UP, DOWN and express functions
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| 16. |
If the left rear window does perform as specified, refer to Left Rear Window Switch Malfunction.
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| 17. |
Command the right rear window UP, DOWN, express UP and express DOWN by using the S79RR window switch-right rear. The right rear window should perform the UP, DOWN and express functions.
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| 18. |
If the right rear window does perform as specified, refer to Right Rear Window Switch Malfunction.
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| Circuit/System Testing |
Window Motor Malfunction
| 1. |
Ignition OFF for, disconnect the harness connector at the appropriate M74 window motor.
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| 2. |
After 10 minutes, test for less than 10 Ω between the ground circuit terminal 1 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
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| 5. |
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
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| 6. |
Test for 5 - 10 V between the serial data circuit terminal 4 and ground.
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| 7. |
If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
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| 8. |
If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
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| 9. |
If all circuits test normal, replace the M74 window motor.
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Driver Window Switch Malfunction
| 1. |
Ignition OFF, disconnect the harness connector at the S79D window switch-driver.
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| 2. |
After 10 minutes, test for less than 10 Ω between the ground circuit terminal 1 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Ignition ON, verify that the scan tool Driver Window Main Control Down Switch parameter is Inactive.
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| 5. |
If not the specified value, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the M74D window motor-driver.
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| 6. |
Connect a 3 A fused jumper wire between the signal circuit terminal 7 and ground. Verify that the scan tool Driver Window Main Control Down Switch parameter is Active.
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| 7. |
If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74D window motor-driver.
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| 8. |
Verify that the scan tool Driver Window Main Control Up Switch parameter is Inactive.
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| 9. |
If not the specified value, test the signal circuit terminal 8 for a short to ground. If the circuit tests normal, replace the M74D window motor-driver.
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| 10. |
Connect a 3 A fused jumper wire between the signal circuit terminal 8 and ground. Verify that the scan tool Driver Window Main Control Up Switch parameter is Active.
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| 11. |
If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74D window motor-driver.
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| 12. |
Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.
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| 13. |
If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the M74 driver window motor.
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| 14. |
Connect a 3 A jumper between signal circuit connection 6 and ground. Verify the scan tool Driver Window Main Control Express Switch parameter is Active.
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| 15. |
If not the specified value, test the signal circuit terminal for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74 driver window motor.
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| 16. |
If all circuits test normal, replace the S79D window switch-driver.
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Passenger Window Switch Malfunction
| 1. |
Ignition OFF, disconnect the harness connector at the S79P window switch-passenger.
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| 2. |
After 10 minutes, test for less than 10 Ω between the ground circuit terminal 1 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Disconnect the harness connector at the S79D window switch-driver.
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| 5. |
Ignition ON, verify that the scan tool Passenger Window Switch at Door parameter is Inactive.
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| 6. |
If the value is Up, test the signal circuit terminal 8 for a short to ground. If the circuit tests normal, test or replace the M74P window motor-passenger.
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| 7. |
If the value is Down, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, test or replace the M74P window motor-passenger.
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| 8. |
If the value is Express, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, test or replace the M74P window motor-passenger.
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| 9. |
Connect a 3 A jumper between signal circuit connection 8 and ground. Check that the scan tool Passenger Window Switch at Door parameter is Active.
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| 10. |
If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74P window motor-passenger.
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| 11. |
Connect a 3 A jumper between signal circuit connection 7 and ground. Check that the scan tool Passenger Window Switch at Door parameter is Down.
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| 12. |
If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74P window motor-passenger.
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| 13. |
Connect a 3 A jumper between signal circuit connection 6 and ground. Check that the scan tool Passenger Window Switch at Door parameter is Express.
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| 14. |
If not the specified value, test the signal circuit terminal for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74 passenger window motor.
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| 15. |
Ignition OFF, connect the harness connector at the S79D window switch-driver.
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| 16. |
Ignition ON, observe the scan tool Passenger Window Switch at Door parameter while using the appropriate front switch on the S79D window switch-driver. The parameters should change from Inactive to Up, Down and Express.
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| 17. |
If the values do not change, test or replace the S79D window switch-driver.
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| 18. |
If all circuits test normal, test or replace the S79P window switch-passenger.
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Driver Rear Window Switch Malfunction
| 1. |
Ignition OFF, disconnect the harness connector at the S79D window switch-driver.
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| 2. |
Observe the scan tool Left Rear Window Main Control Down Switch, Left Rear Window Main Control Up Switch and Left Rear Window Main Control Express Switch parameters while using the switch for the rear left on the S79D Window Switch-Driver. Each parameter should change from Inactive to Active as the rear left switch is used.
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| 3. |
If all or some of the values are always Active or always Inactive, replace the S79D window switch-driver.
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| 4. |
Observe the scan tool Right Rear Window Main Control Down Switch, Right Rear Window Main Control Up Switch and Right Rear Window Main Control Express Switch parameters while using the right rear switch on the S79D Window Switch-Driver. Each parameter should change from Inactive to Active as the rear right switch is used.
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| 5. |
If all or some of the values are always Active or always Inactive, replace the S79D window switch-driver.
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Left Rear Window Switch Malfunction
| 1. |
Ignition OFF, disconnect the harness connector at the S79LR window switch-left rear.
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| 2. |
Test for less than 25 Ω between the ground circuit terminal 1 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Ignition ON, verify that the scan tool Left Rear Window Switch at Door parameter is Inactive.
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| 5. |
If the parameter is Up, test the control circuit terminal 8 for a short to ground. If the circuit tests normal, test or replace the M74LR window motor-left rear.
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| 6. |
If the parameter is Down, test the control circuit terminal 7 for a short to ground. If the circuit tests normal, test or replace the74LR window motor-left rear.
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| 7. |
If the parameter is Express, test the control circuit terminal 6 for a short to ground. If the circuit tests normal, test or replace the 74LR window motor-left rear.
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| 8. |
Connect a 5 A jumper between control circuit connection 6 and ground. Check that the scan tool Left Rear Window Switch at Door parameter is Express.
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| 9. |
If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the74LR window motor-left rear.
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| 10. |
Connect a 5 A jumper between control circuit connection 7 and ground. Check that the scan tool Left Rear Window Switch at Door parameter is Down.
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| 11. |
If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the74LR window motor-left rear.
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| 12. |
Connect a 5 A jumper between control circuit connection 8 and ground. Check that the scan tool Left Rear Window Switch at Door parameter is Up.
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| 13. |
If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the74LR window motor-left rear.
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| 14. |
If all circuits test normal, test or replace the S79LR window switch-left rear.
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Right Rear Window Switch Malfunction
| 1. |
Ignition OFF, disconnect the harness connector at the S79RR window switch-right rear.
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| 2. |
Test for less than 25 Ω between the ground circuit terminal 1 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Ignition ON, verify that the scan tool Right Rear Window Switch at Door parameter is Inactive.
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| 5. |
If the parameter is Up, test the control circuit terminal 8 for a short to ground. If the circuit tests normal, test or replace the M74RR window motor-right rear.
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| 6. |
If the parameter is Down, test the control circuit terminal 7 for a short to ground. If the circuit tests normal, test or replace the74RR window motor-right rear.
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| 7. |
If the parameter is Express, test the control circuit terminal 6 for a short to ground. If the circuit tests normal, test or replace the 74RR window motor-right rear.
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| 8. |
Connect a 5 A jumper between control circuit connection 6 and ground. Check that the scan tool Right Rear Window Switch at Door parameter is Express.
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| 9. |
If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the74RR window motor-right rear.
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| 10. |
Connect a 5 A jumper between control circuit connection 7 and ground. Check that the scan tool Right Rear Window Switch at Door parameter is Down.
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| 11. |
If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the74RR window motor-right rear.
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| 12. |
Connect a 5 A jumper between control circuit connection 8 and ground. Check that the scan tool Right Rear Window Switch at Door parameter is Up.
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| 13. |
If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the74RR window motor-right rear.
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| 14. |
If all circuits test normal, test or replace the S79RR window switch-right rear.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Rear Side Door Window Switch Replacement
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Front Side Door Window Regulator Motor Replacement
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Rear Side Door Window Regulator Motor Replacement
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