B2181

B2181-HEATED SEAT MODULE POWER SUPPLY LOW

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

- When Monitored:
During heated seat operation.

- Set Condition:
This code is set immediately if the Heated Seat Module (HSM) detects voltage under 10 volts on the (F98) Fused Ignition Switch Output (Run) circuit.





Diagnostic Test

1. CHECK PCM FOR CHARGING SYSTEM DTC
1. Turn the ignition on.
2. With the scan tool, clear all DTC's.
3. Cycle the ignition switch from on to off.
4. Start the engine.
5. Run the engine at approximately 1500 RPM for 1 minute.
6. With the scan tool, read DTCs.

Are there any Charging System DTCs set in the PCM?

Yes

- Charging System and Testing and Inspection for Charging System diagnostic procedures.

No

- Go To 2

2. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition switch to the off position then start the engine and operate the heated seats for one minute.
2. With the scan tool, read DTC's.

Does the scan tool read active: B2181-HEATED SEAT MODULE POWER SUPPLY LOW?

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 BODY VERIFICATION TEST. Body Verification Test.

3. (F98) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the Heated Seat Module connector.
3. Start the engine and let idle.
4. Using a 12-volt test light connected to ground, check the (F98) 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

- Go To 4

No

- Repair the (F98) Fused Ignition Switch Output (Run) circuit as necessary.
- Perform BODY VERIFICATION TEST. Body Verification Test.

4. (P693) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT HIGH RESISTANCE
1. Start the engine and let idle.
2. Using a 12-volt test light connected to ground, check the (P693) 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 (HSM).
- Perform BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the (P693) Fused Ignition Switch Output (Run) circuit as necessary.
- Perform BODY VERIFICATION TEST. Body Verification Test.