Diagnostic Test

1) VERIFY THAT DTC B1096-FRONT RIGHT SEAT HEATER CONTROL CIRCUIT LOW IS ACTIVE
With the scan tool, record and erase DTC's

Operate the Heated Seat Switch in both positions several times.

With the scan tool, read DTC's.

Does the DTC B1096 - FRONT RIGHT SEAT HEATER CONTROL CIRCUIT LOW reset?

Yes
1. Go To 2).
No
1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1 ).
2) DISCONNECT RIGHT CUSHION HEATER 4-WAY CONNECTOR AND READ DTC'S

Fig 1: Right Seat Cushion Heater 4-Way Connector
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Left Seat Cushion Heater 4 - way connector.

NOTE: Check connectors - Clean and repair as necessary.

With the scan tool, erase HSM DTC's

Operate the Heated Seat Switch in both positions several times.

With the scan tool, read DTC's.

Does the scan tool display the same DTC?

Yes
1. Go To 5).
No
1. Go To 3).
3) CHECK THE (P188) RIGHT SEAT HEATER B(+) DRIVER FOR A SHORT TO GROUND AT THE SEAT

Fig 2: Measure Resistance Between Right Seat Heater B(+) Driver Circuit At Right Seat Heater Connector (Component Side) And Seat Frame
Courtesy of DAIMLERCHRYSLER CORP.

Measure between the (P188) Right Seat Heater B(+) Driver circuit at the Right Seat Heater connector (component side) and the seat frame for a short to ground.

Is the resistance below 1000 ohms?

No
1. Go To 4).
Yes
1. Repair/replace the pigtail/heating element as necessary for a short to ground condition.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1 ).
4) CHECK THE RIGHT HEATER ELEMENT SEAT CUSHION AND SEAT BACK RESISTANCE

Fig 3: Measuring Resistance Between Right Seat Heater B(+) Driver Circuit And Ground Circuit At Seat Cushion And Seat Back Heater Connectors
Courtesy of DAIMLERCHRYSLER CORP.

Gain access to the seat cushion and seat back heater connectors.

Check the resistance of each of the heater elements by measuring between the (P188) Right Seat Heater B(+) Driver and the Ground circuit at the seat cushion and seat back heater connectors.

For the seat cushion element the resistance value is 3 to 5.5 ohms.

For the seat back element the resistance value is 4 to 6 ohms.

Is the resistance correct for each heater element?

Yes
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent short to ground.
No
1. Replace the heater element as necessary.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1 ).
5) CHECK THE (P188) RIGHT SEAT HEATER B(+) DRIVER CIRCUIT FOR A SHORT TO GROUND

Fig 4: Measuring Resistance Between HSM Connector & Ground
Courtesy of DAIMLERCHRYSLER CORP.

Ensure the Right Seat Cushion Heater 4 - way connector is still disconnected.

Disconnect the Heated Seat Module connector.

NOTE: Check connectors - Clean and repair as necessary.

Measure the (P188) Right Seat Heater B(+) Driver circuit cavity K for (LHD) or D for (RHD) at the HSM connector to ground.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (P188) Right Seat Heater B(+) Driver circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1 ).
No
1. Replace the Heated Seat Module.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1 ).