B2181

B2181-HEATED SEAT MODULE POWER SUPPLY LOW



- 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.





1. CHECK ECM/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 DTC's set in the ECM/PCM?

Yes

- Testing and Inspection for Charging System diagnostic procedures.

No

- Go To 2

2. TEST FOR INTERMITTENT CONDITION
1. With the scan tool, clear all DTC's.
2. Turn the ignition switch to the off position then start the engine and operate the heated seats for one minute.
3. 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

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- 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.

NOTE: Check connectors - Clean and repair as necessary.

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.