Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Diagnose and repair all active Bus related Diagnostic Trouble Codes (DTCs) including Lost Communication DTCs before diagnosing this DTC.
1. With the scan tool, read Comfort Seat Wheel Module (CSWM)) DTCs and record on the repair order.
2. With the scan tool, erase CSWM DTCs.
3. Turn the ignition off.
4. Start the Engine.
5. With the scan tool, read CSWM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2.
  No
  - The conditions that caused this DTC to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Attempt to reproduce condition by rotating the steering wheel. Repair as necessary. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE HEATED STEERING WHEEL TEMPERATURE SENSOR
WARNING:
Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Remove the Driver Airbag in accordance with the Service Information. Refer to AIR BAG, DRIVER, REMOVAL AND INSTALLATION .
2. Disconnect the Heated Steering Wheel (HSW) C1 harness connector.
  NOTE:
  Before proceeding, thoroughly inspect the wiring harness and connectors between the HSW and the Left Steering Wheel Switch. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
  
  WARNING:
  Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
3. Measure the voltage between the (C92) Heated Steering Wheel Signal circuit and the (Z935) Ground circuit at the HSW C1 harness connector.
  Is the voltage between 4.8 and 5.2 volts?
  
  Yes
  - Replace the Heated Steering Wheel (HSW) in accordance with the Service Information. Refer to WHEEL, STEERING, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3.
CHECK THE (C92) HEATED STEERING WHEEL SIGNAL CIRCUIT FOR AN OPEN
WARNING:
Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Disconnect the Left Steering Wheel Switch harness connector.
2. Measure the resistance of the (C92) Heated Steering Wheel Signal circuit between the HSW C1 harness connector and the Left Steering Wheel Switch harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the (C92) Heated Steering Wheel Signal circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (C92) HEATED STEERING WHEEL SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (C92) Heated Steering Wheel Signal circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (C92) Heated Steering Wheel Signal circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5.
CHECK THE (Z935) GROUND CIRCUIT FOR AN OPEN
1. Measure the resistance of the (Z935) Ground Circuit between the Heated Steering Wheel C1 harness connector and the Left Steering Wheel Switch harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (Z935) Ground Circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE LEFT STEERING WHEEL SWITCH
1. Replace the Left Steering Wheel Switch in accordance with the Service Information. Refer to SWITCH, EVIC CONTROL, REMOVAL AND INSTALLATION .
2. Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  Does this DTC return?
  
  Yes
  - Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Test complete.