Diagnostic Test
- CHECK ECM/PCM FOR CHARGING SYSTEM DTC
- With the scan tool, read ECM/PCM DTC's.
Are there any Charging System DTC's set in the ECM/PCM?
Yes
- Refer to Electrical/Charging - Diagnosis and Testing or DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing for Charging System diagnostic procedures.
No
- Go to step 2
- With the scan tool, read ECM/PCM DTC's.
- VERIFY THAT DTC B2181-HEATED SEAT MODULE POWER SUPPLY LOW IS ACTIVE
- With the scan tool, record and erase DTC's
- Turn the ignition switch to the Off position then start the engine and operate the heated seats for one minute.
- With the scan tool, read DTC's.
Does the DTC B2181-HEATED SEAT MODULE POWER SUPPLY LOW reset?
Yes
- Go to step 3
No
- The conditions that caused this code to set are not present at this time. Using the SYSTEM WIRING DIAGRAMS as a guide, inspect the wiring and connectors.
- Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
- (F937) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT HIGH RESISTANCE
- Disconnect the Heated Seat Module connector.NOTE: Check connectors - Clean and repair as necessary.
- Start the engine and let idle.
- Using a 12-volt test light connected to ground, check the (F937) Fused Ignition Switch Output (Run) circuit at the HSM connector.NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Replace the Heated Seat Module in accordance with the service information.
- Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
No
- Repair the (F937) Fused Ignition Switch Output (Run) circuit as necessary.
- Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
- Disconnect the Heated Seat Module connector.