Driving Mode Switch Malfunction
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Driving Mode Switch Malfunction
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Suspension System Mode
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating Conditions:
Engine running, normal operating temperature
Parameter Normal Range:
Comfort/Sport Mode/Normal/Hard
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Sport Mode Switch Signal Circuit
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Undefined
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-
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Undefined
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Circuit/System Description
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The sport mode switch, comfort mode switch and intelligent mode switch are combined into one switch module. The body control module (BCM) monitors the switch module. When a driving mode has been selected, the BCM transmits commands to the continuous damping control, steering control, four wheel drive and automatic transmission via serial data transmission in order to control the car's driving characteristics according to the selected mode. The BCM informs the driver about the selected driving mode by switching ON the appropriate LED.
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Transmission System Description and Operation (M36 and MXE)
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Verify no communication related DTC is set.
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2.
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If any communication DTC is set, diagnose those first.
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3.
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Ignition ON, observe the scan tool Suspension System Mode parameter while switching one after the other sport mode, comfort mode and intelligent mode. Verify the reading changes between Normal/Comfort/Sport/Hard.
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4.
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If the parameter does not change between the specified values, go to Circuit/System Testing.
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5.
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Observe the sport mode LED, comfort mode LED and intelligent mode LED while switching one after the other sport mode, comfort mode and intelligent mode. The appropriate LED and the tour mode LED should turn ON and OFF.
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6.
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If the LED does not change between the specified values, go to Circuit/System Testing.
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Note
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You must perform the circuit/system verification before proceeding with circuit/system testing.
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Static Test
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1.
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Ignition OFF, disconnect the X3 and X6 harness connector at the K9 Body Control Module.
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2.
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Ignition ON, verify the sport mode LED and comfort mode LED are OFF.
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3.
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If the sport mode LED and/or comfort mode LED does not turn OFF, test the appropriate control circuit for a short circuit to voltage. If the circuit test result is normal, replace the K9 chassis control module.
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Sport mode LED - S109 Sport Mode Switch terminal 2
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•
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Comfort mode LED - S109 Sport Mode Switch terminal 7
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4.
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Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module.
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5.
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Ignition ON, verify the intelligent mode LED is OFF.
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6.
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If the intelligent mode LED does not turn OFF, test the appropriate control circuit S109 Sport Mode Switch terminal 6 for a short to voltage.
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Note
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You must perform the circuit/system verification before proceeding with circuit/system testing.
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Dynamic Test
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1.
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Ignition OFF, connect all K9 Body Control Module harness connectors.
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2.
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Disconnect the S109 Sport Mode Switch harness connector.
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3.
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Test for less than 5 Ω between S109 Sport Mode Switch terminal 5 and ground.
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4.
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If not within the specified value, test the wiring harness for an open/high resistance.
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5.
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Ignition ON, test for less than 0.3 V between S109 Sport Mode Switch terminal 2 and ground.
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6.
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If not within the specified value, test the wiring harness for a short to voltage. If the circuit test normal, replace the K9 Body Control Module.
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7.
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Ignition ON, test for less than 0.3 V between S109 Sport Mode Switch terminal 7 and ground.
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8.
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If not within the specified value, test the wiring harness for a short to voltage. If the circuit test normal, replace the K9 Body Control Module.
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9.
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Ignition ON, connect the S109 Sport Mode Switch terminal 4 and ground with a fused jumper wire. Test for less than 0.3 V between S109 Sport Mode Switch terminal 6 and ground.
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10.
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If not within the specified value, test the wiring harness for a short to voltage. If the circuit test normal, replace the K9 Body Control Module.
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11.
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Ignition OFF, test for infinite resistance between S109 Sport Mode Switch terminal 2 and ground.
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12.
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If not within the specified value, test the wiring harness for a short to ground. If the circuit test normal, replace the K9 Body Control Module.
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13.
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Test for infinite resistance between S109 Sport Mode Switch terminal 7 and ground.
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14.
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If not within the specified value, test the wiring harness for a short to ground. If the circuit test normal, replace the K9 Body Control Module.
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15.
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Test for infinite resistance between S109 Sport Mode Switch terminal 6 and ground.
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16.
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If not within the specified value, test the wiring harness for a short to ground. If the circuit test normal, replace the K9 Body Control Module.
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17.
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Ignition ON, observe the scan tool Suspension System Mode parameter while installing a 3 A fused jumper wire between the S109 Sport Mode Switch terminal 4 and ground. Verify the reading changes between Normal/Sport Mode.
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18.
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If the parameter does not change between the specified values, test the wiring harness for short to voltage, short to ground or an open/high resistance. If the circuit test normal, replace the K9 Body Control Module.
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19.
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Ignition OFF, connect a test lamp to S109 Sport Mode Switch terminal 2 and ground.
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20.
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Ignition ON, the test lamp has to illuminate while installing a 3 A fused jumper wire between the S109 Sport Mode Switch terminal 4 and ground.
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21.
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If the test lamp does not illuminate, test the sport mode LED signal circuit for an open/high resistance.
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22.
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Ignition ON, observe the scan tool Suspension System Mode parameter while installing a 3 A fused jumper wire between the S109 Sport Mode Switch terminal 3 and ground. Verify the reading changes between Normal/Comfort Mode.
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23.
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If the parameter does not change between the specified values, test the wiring harness for short to voltage, short to ground or an open/high resistance. If the circuit test normal, replace the K9 Body Control Module.
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24.
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Ignition OFF, connect a test lamp to S109 Sport Mode Switch terminal 7 and ground.
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25.
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Ignition ON, the test lamp has to illuminate while installing a 3 A fused jumper wire between the S109 Sport Mode Switch terminal 3 and ground.
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26.
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If the test lamp does not illuminate, test the comfort mode LED signal circuit for an open/high resistance.
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27.
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Ignition OFF, remove the fused jumper wire. Connect a test lamp to S109 Sport Mode Switch terminal 6 and ground.
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28.
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Ignition ON, the test lamp has to illuminate.
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29.
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If the test lamp does not illuminate, test the intelligent mode LED signal circuit for an open/high resistance.
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30.
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If the circuit test normal, test or replace the S109 Sport Mode Switch.
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Dynamic Test
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1.
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Ignition OFF, disconnect the S109 Sport Mode Switch.
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2.
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Connect the S109 Sport Mode Switch terminal 5 and ground with a fused jumper wire.
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3.
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Choose intelligent mode at the S109 Sport Mode Switch.
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4.
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Test for infinite resistance between S109 Sport Mode Switch terminal 3 and terminal 4 and ground.
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5.
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If not within the specified value, replace the S109 Sport Mode Switch.
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6.
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Choose sport mode at the S109 Sport Mode Switch.
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7.
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Test for less than 5 Ω between S109 Sport Mode Switch terminal 4 and ground.
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8.
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If not within the specified value, replace the S109 Sport Mode Switch.
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9.
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Choose comfort mode at the S109 Sport Mode Switch.
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10.
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Test for less than 5 Ω between S109 Sport Mode Switch terminal 3 and ground.
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11.
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If not within the specified value, replace the S109 Sport Mode Switch.
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12.
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Ignition ON, connect the S109 Sport Mode Switch terminal 2 and B+ with a fused jumper wire. Sport mode LED has to illuminate.
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13.
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If not within the specified value, replace the S109 Sport Mode Switch.
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14.
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With the ignition ON, use a fused bridging link to connect the 6 and B+ connector pins of the S109 Sport mode switch. The intelligent mode LED must illuminate.
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15.
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If not within the specified value, replace the S109 Sport Mode Switch.
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16.
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With the ignition ON, use a fused bridging link to connect the 7 and B+ connector pins of the S109 sport mode switch. The comfort mode LED must illuminate.
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17.
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If not within the specified value, replace the S109 Sport Mode Switch.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
