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 B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN 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 B1094 FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN 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 .
CHECK FOR AN OPEN SEAT HEATER B(+) DRIVER FROM HSM TO SEAT CUSHION
Disconnect the Left Cushion Pad Heater 2 - way connector.

Disconnect the Heated Seat Module 6 - way connector.

NOTE: Check connectors - Clean and repair as necessary.

Measure the resistance of the Left Seat Heater B(+) Driver circuit from the HSM 6 - way to the Cushion Pad Heater 2 - way connector.

Is the resistance below 2 ohms?
- Yes: Go To 3
- No: Repair the open Seat Heater B(+) Driver circuit.
  Perform BODY VERIFICATION TEST - VER 1 .
Fig 1: Checking For An Open Seat Heater B(+) Driver From HSM To Seat Cushion
Courtesy of DAIMLERCHRYSLER CORPORATION
CHECK THE LEFT SEAT HEATER CUSHION GROUND CIRCUIT
Using a 12-volt test light connected to 12-volts, check the ground circuit at the Heater Cushion Pad 2 - way connector.

Does the test light illuminate brightly?
- Yes: Go To 4
- No: Repair the open ground circuit.
  Perform BODY VERIFICATION TEST - VER 1 .
Fig 2: Checking Left Seat Heater Cushion Ground Circuit
Courtesy of DAIMLERCHRYSLER CORPORATION
CHECK THE LEFT CUSHION PAD HEATER RESISTANCE
Check the resistance of the Cushion Pad Heater element by measuring between the Left Seat Heater B(+) Driver and the Ground circuit at the 2 - way connector (component side).

Is the resistance above 4.9 ohms?
- Yes: Replace the seat cushion pad heater element as necessary.
  Perform BODY VERIFICATION TEST - VER 1 .
- No: 5
  Perform BODY VERIFICATION TEST - VER 1 .
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 connector 2 - way (component side).

Is the resistance above 5.5 ohms?
- Yes: Replace the seat back heater element as necessary.
  Perform BODY VERIFICATION TEST - VER 1 .
- No: 6
  Perform BODY VERIFICATION TEST - VER 1 .
Fig 4: Checking Left Seat Back Heater Resistance
Courtesy of DAIMLERCHRYSLER CORPORATION
CHECK THE LEFT SEAT BACK HEATER GROUND CIRCUIT
Using a 12-volt test light connected to 12-volts, check the ground circuit at the Seat Back Heater 2 - way connector.

Does the test light illuminate brightly?
- Yes: Go To 7
- No: Repair the open ground circuit.
  Perform BODY VERIFICATION TEST - VER 1 .
Fig 5: Checking Left Seat Back Heater Ground Circuit
Courtesy of DAIMLERCHRYSLER CORPORATION
CHECK FOR AN OPEN SEAT HEATER B(+) DRIVER FROM HSM TO SEAT BACK
NOTE: Check connectors - Clean and repair as necessary.

Measure the Left Seat Heater B(+) Driver circuit from the Seat Back connector to the HSM connector.

Is the resistance below 2.0 ohms?
- Yes: Replace the Heated Seat Module.
  Perform BODY VERIFICATION TEST - VER 1 .
- No: Repair the Left Seat Heater B(+) Driver circuit for an open back to the splice.
  Perform BODY VERIFICATION TEST - VER 1 .
Fig 6: Checking For An Open Seat Heater B(+) Driver From HSM To Seat Back
Courtesy of DAIMLERCHRYSLER CORPORATION