Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Test
- CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCs)
- Turn the ignition on.
- With the scan tool, read Powertrain Control Module (PCM) DTCs.
Are there any Charging System DTCs set in the PCM?
Yes
- Refer to Diagnosis and Testing for Charging System diagnostic procedures .
No
- Go To 2.
- VERIFY DTC B2182-HEATED SEAT MODULE POWER SUPPLY HIGH IS ACTIVE
- With the scan tool, record and erase DTCs.
- Turn the ignition off.
- Start the engine and let it run for one minute.
- With the scan tool, read DTCs.
Does the scan tool display this DTC as active?
Yes
- Go To 3.
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
- CHECK (F937) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT VOLTAGE
- Turn the ignition off.
- Disconnect the HSM harness connector.NOTE:
Check connectors. Clean and repair as necessary.
- Start the engine and let idle.
- Measure the voltage of the (F937) Fused Ignition Switch Output (Run) circuit between the HSM connector and ground and compare it to the voltage at the vehicle battery.
Is the voltage measured at the HSM connector the same as the voltage measured at the battery?
Yes
- Replace the Heated Seat Module (HSM) in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
No
- Repair the (F937) Fused Ignition Switch Output (Run) circuit for the cause of the high voltage condition at the HSM.
- Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.