DTC B251A-B251F
| DTC B251A-B251F |
| 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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| DTC Descriptors |
DTC B251A 01
All Door Unlatch Circuit Short to Battery
DTC B251A 02
All Door Unlatch Circuit Short to Ground
DTC B251B 02
Driver Door Unlatch High Control Circuit Short to Ground
DTC B251C 02
Passenger Door Unlatch High Control Circuit Short to Ground
DTC B251D 02
Left Rear Door Unlatch High Control Circuit Short to Ground
DTC B251E 02
Right Rear Door Unlatch High Control Circuit Short to Ground
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Driver Door Unlatch High Control
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B251B 02
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1
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1
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-
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Left Rear Door Unlatch High Control
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B251D 02
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1
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1
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-
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Passenger Door Unlatch High Control
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B251C 02
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1
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1
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-
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Right Rear Door Unlatch High Control
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B251E 02
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1
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1
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-
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Driver Door Unlatch Low Control
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B251A 02
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1
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B251B 01
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-
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Left Rear Door Unlatch Low Control
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B251A 02
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1
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B251B 01
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-
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Passenger Door Unlatch Low Control
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B251A 02
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1
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B251B 01
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-
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Right Rear Door Unlatch Low Control
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B251A 02
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1
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B251B 01
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-
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1. Door Unlatch Malfunction
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| Circuit/System Description |
When any exterior door handle is lifted, switched ground signals are sent to the keyless entry control module through the door handle switch signal circuits. Upon receipt of these inputs, the keyless entry control module will check the door lock status of the following inputs:
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Door unlock switch activation
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Keyless entry unlock command
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Passive keyless entry unlock command message is received by the keyless entry control module
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Once the enable criteria has been met, the keyless entry control module will supply power and ground to door latch control circuits and the door will release.
| Conditions for Running the DTC |
Battery voltage is between 9-16 V.
| Conditions for Setting the DTC |
B251A 01
The keyless entry control module detects a short to voltage in any door unlatch motor unlatch control low circuit.B251A 02
The keyless entry control module detects a short to ground in any door unlatch motor unlatch control low circuit.B251B 02
The keyless entry control module detects a short to ground in the driver door unlatch motor unlatch control high circuit.B251C 02
The keyless entry control module detects a short to ground in the passenger door unlatch motor unlatch control high circuit.B251D 02
The keyless entry control module detects a short to ground in the left rear door unlatch motor unlatch control high circuit.B251E 02
The keyless entry control module detects a short to ground in the right rear door unlatch motor unlatch control high circuit.| Action Taken When the DTC Sets |
The keyless entry control module ignores inputs from the exterior door handle switches.
| Conditions for Clearing the DTC |
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This DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 50 ignition cycles.
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| Reference Information |
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Power Door Latch 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 |
Ignition ON, command the Driver Door Unlatch and Passenger Door(s) Unlatch with the scan tool. The driver and passenger door latches should latch and unlatch when changing between commanded states.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the malfunctioning door latch assembly.
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| 2. |
Ignition ON, verify that a test lamp does not illuminate between control circuit terminal 5 and ground.
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| 3. |
If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal replace the K84 Keyless Entry Control Module.
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| 4. |
Verify that a test lamp does not illuminate between control circuit terminal 10 and ground.
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| 5. |
If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal replace the K84 Keyless Entry Control Module.
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| 6. |
Verify that a test lamp does not illuminate between control circuit terminal 5 and B+.
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| 7. |
If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal replace the K84 Keyless Entry Control Module.
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| 8. |
Verify that a test lamp does not illuminate between control circuit terminal 10 and B+.
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| 9. |
If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal. replace the K84 Keyless Entry Control Module
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| 10. |
Connect a test lamp between the control circuit terminals 5 and 10.
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| 11. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 12. |
Verify the test lamp illuminates briefly, while pulling the exterior door handle.
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| 13. |
If the test lamp does not illuminate, test the control circuits for an open circuit/high resistance. If the circuits test normal, replace K84 Keyless Entry Control Module.
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| 14. |
If all circuits test normal, test or replace the door latch assembly.
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| Component Testing |
Door Latch Assembly Test
| 1. |
Ignition OFF, disconnect the harness connector at the appropriate door latch assembly.
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| 2. |
Ignition ON, install a 15 A fused jumper wire between the control terminal listed below and B+:
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Left hand drive: Driver door latch control terminal 10
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Left hand drive: Passenger door latch control terminal 5
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Right hand drive: Driver door latch control terminal 5
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Right hand drive: Passenger door latch control terminal 10
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Left rear door latch control terminal 10
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Right rear door latch control terminal 5
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| 3. |
Momentarily install a jumper wire between the control terminal listed below and ground. The door latch should perform the Unlock function:
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Left hand drive: Driver door latch control terminal 5
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Left hand drive: Passenger door latch control terminal 10
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Right hand drive: Driver door latch control terminal 10
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Right hand drive: Passenger door latch control terminal 5
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Left rear door latch control terminal 5
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Right rear door latch control terminal 10
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| 4. |
If the function does not perform as specified, replace the door latch.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Front Side Door Lock Replacement
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Rear Side Door Lock Replacement
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Control Module References
for keyless entry control module replacement, setup and programming
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