Heated Seat Module (HSM)

B21DD-85-SYSTEM VOLTAGE - SIGNAL ABOVE ALLOWABLE RANGE

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the engine running.

- Set Condition:
The Heated Seat Module (HSM) receives a system Voltage above 16.0 volts status message through the CAN Bus.





1. CHECK FOR CHARGING SYSTEM DTCs

NOTE: If present, diagnose and repair DTC U0140- 00 Lost Communication With Body Control Module before proceeding with this diagnostic procedure.

1. Turn the ignition on.
2. Using a scan tool, read Powertrain Control Module (PCM) DTCs.

Are there any Charging System DTCs set in the PCM?

Yes

- Testing and Inspection for Charging System diagnostic procedures.

No

- Go To 2

2. CHECK FOR DTCs IN BCM
1. Using a scan tool, read BCM DTCs.

Are there any DTCs set in the BCM?

Yes

- Diagnose and repair the DTC(s). Testing and Inspection

No

- Go To 3

3. CHECK FOR ACTIVE DTC B210C17-BATTERY VOLTAGE INPUT - CIRCUIT ABOVE THRESHOLD IN HSM
1. Using a scan tool, read HSM DTCs.

Is DTC B210C-17-BATTERY VOLTAGE INPUT - CIRCUIT ABOVE THRESHOLD active?

Yes

- Diagnose and repair the DTC. Testing and Inspection.

No

- Go To 4

4. VERIFY THIS DTC IS ACTIVE

NOTE:
- Make sure the Battery is in good condition. Using a suitable Battery Tester, test the Battery before continuing.
- Make sure system voltage is in the normal operating range of approximately 12 to 14 volts before continuing.
- Inspect the vehicle for aftermarket accessories that may exceed the Generator System output.
- Make sure the generator drive belt is in good operating condition.
- Inspect the fuses. If an open fuse is found, use the wire diagram/schematic as a guide, inspect the wiring and connectors for damage.

1. Using a scan tool, record and erase DTCs.
2. Turn the ignition Off.
3. Start the engine and let run for one minute.
4. Using a scan tool, read DTCs.

Is the DTC active?

Yes

- Replace the Heated Seat Module (HSM). Heated Seat Module - Removal.
- Perform BODY VERIFICATION TEST. Body Verification Test.

No

- The conditions that caused this code to set are not present at this time.
- Perform BODY VERIFICATION TEST. Body Verification Test.