B1E99-12

B1E99-12-FRONT LEFT HEATER CONTROL CIRCUIT - CIRCUIT SHORT TO BATTERY

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





- When Monitored:
With the engine running.

- Set Condition:
The Heated Seat Module (HSM) detects on the Left Front Seat Heater Control circuit a voltage above 5.0 volts for more than two seconds with the output turned off.





Diagnostic Test

1. CHECK IF THE DTC IS ACTIVE

NOTE: Make sure the battery is fully charged and the charging system is operating properly before proceeding.

1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs).

NOTE: It is recommended to record any Environmental Data to help identify the conditions in which the DTC was set.

3. Turn the ignition off.
4. Ignition on, engine running.

NOTE: The Front Left Seat Heater should be in the off position and remain off for the results of the test to be valid.

5. With the scan tool, read Heated Seat Module (HSM) DTCs.

Does the scan tool show this DTC as active?

Yes

- Go To 2

No

- Go To 4

2. CHECK THE (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Heated Seat Module (HSM) C2 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

3. Ignition on, engine running.
4. Measure the voltage between ground and the (P187) Left Front Seat Heater Control circuit in the HSM C2 harness connector.

Is the voltage 5.0 volts or above?

Yes

- Repair the (P187) Left Front Seat Heater Control circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Go To 3

3. CHECK THE (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO VOLTAGE DURING SEAT ADJUSTMENT
1. Measure the voltage between ground and the (P187) Left Front Seat Heater Control circuit at the HSM C2 harness connector while adjusting the seat in all positions.

Is the voltage 5.0 volts or above any time during the seat adjustment?

Yes

- Repair the (P187) Left Front Seat Heater Control circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

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

4. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorted and open circuits. Attempt to reproduce condition by adjusting the seat.
3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. With the scan tool, check for any Environmental Data to help identify the conditions in which the DTC was set.
5. Check Service Bulletins for any possible causes that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Test complete.