Heated Seat Module (HSM)

B21DD-84-SYSTEM VOLTAGE - SIGNAL BELOW 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 battery Voltage below 10.0 volts status message through the CAN Bus.





1. CHECK FOR CHARGING SYSTEM DTCs

NOTE: If present, diagnose and repair DTC U0141-00 Lost Communication With IPM (FCM/TIPM) 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 TIPM
1. Using a scan tool, read TIPM DTCs.

Are there any DTCs set in the TIPM?

Yes

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

No

- Go To 3

3. CHECK FOR ACTIVE DTC B210C-18-BATTERY VOLTAGE INPUT - CIRCUIT BELOW THRESHOLD IN HSM
1. Using a scan tool, read HSM DTCs.

Is DTC B210C-18-BATTERY VOLTAGE INPUT - CIRCUIT BELOW 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 it run for one minute.
4. Using a scan tool, read DTCs.

Is the DTC active?

Yes

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

No

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