Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THAT DTC B1092-FRONT LEFT 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 B1092 FRONT LEFT SEAT HEATER CONTROL CIRCUIT LOW reset?
- Yes: Go To 2
- No: 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.
  Perform BODY VERIFICATION TEST - VER 1 .
DISCONNECT LEFT SEAT INLINE CONNECTOR AND READ DTC'S
Disconnect the left seat C306 inline 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: Go To 6
- No: Go To 3
Fig 1: Identifying Left Seat Inline Connector
Courtesy of DAIMLERCHRYSLER CORPORATION
CHECK THE (P187) LEFT SEAT HEATER B(+) DRIVER FOR A SHORT TO GROUND
Measure between the (P187) Left Seat Heater B(+) Driver circuit at the seat inline connector (seat side) and the seat frame for a short to ground.

Is the resistance below 1000 ohms?
- Yes: Repair/replace the pigtail/heating element as necessary for a short to ground condition.
  Perform BODY VERIFICATION TEST - VER 1 .
- No: Go To 4
Fig 2: Checking (P187) Left Seat Heater B(+) Driver For A Short To Ground
Courtesy of DAIMLERCHRYSLER CORPORATION
CHECK THE LEFT CUSHION PAD HEATER RESISTANCE
Disconnect the Left Cushion Pad Heater 2 - way connector.

Check the resistance of the cushion heater element by measuring between the Left Seat Heater B(+) Driver and the Ground circuit at the left cushion pad connector (component side).

Was the resistance below 3.5 ohms?
- Yes: Replace the heater element as necessary.
  Perform BODY VERIFICATION TEST - VER 1 .
- No: Go To 5
Fig 3: Checking Left Cushion Pad Heater Resistance
Courtesy of DAIMLERCHRYSLER CORPORATION
CHECK THE LEFT SEAT BACK HEATER RESISTANCE
Disconnect the Left Seat Back Heater 2 - way connector.

NOTE: Check connectors - Clean and repair as necessary.

Check the resistance of the seat back heater element by measuring between the Left Seat Heater B(+) Driver and the Ground circuit at the left seat back connector (component side).

Is the resistance below 4.0 ohms?
- Yes: Replace the seat back heater element as necessary.
  Perform BODY VERIFICATION TEST - VER 1
- No: Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent short to ground.
  Perform BODY VERIFICATION TEST - VER 1
Fig 4: Checking Left Seat Back Heater Resistance
Courtesy of DAIMLERCHRYSLER CORPORATION
CHECK THE LEFT SEAT HEATER B(+) DRIVER CIRCUIT FOR A SHORT TO GROUND
Disconnect the Heated Seat Module connector.

NOTE: Check connectors - Clean and repair as necessary.

Measure the Left Seat Heater B(+) Driver circuit to ground at the HSM connector.

Is the resistance below 5.0 ohms?
- Yes: Repair the Left Seat Heater B(+) Driver circuit for a short to ground.
  Perform BODY VERIFICATION TEST - VER 1 .
- No: Replace the Heated Seat Module.
  Perform BODY VERIFICATION TEST - VER 1 .
Fig 5: Checking Left Seat Heater B(+) Driver Circuit For A Short To Ground
Courtesy of DAIMLERCHRYSLER CORPORATION