B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
Ignition on, during the heated seat operation.
- Set Condition:
This code is set immediately after the Heated Seat Module detects an open in the seat heater B(+) driver circuit.
| Possible Causes |
| (P187) LEFT SEAT HEATER B(+) DRIVER WIRE OPEN |
| GROUND WIRE OPEN |
| SEAT CUSHION HEATER ELEMENT OPEN |
| SEAT BACK HEATER ELEMENT OPEN |
| HEATED SEAT MODULE |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1. VERIFY THAT DTC B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN IS ACTIVEWith 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 To2
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.
2. 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 (P187) Left Seat Heater B(+) Driver circuit from the HSM 6 – way Cavity 3 for LHD and 4 for RHD 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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
3. 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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
4. 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
- Go To5
5. 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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To6
6. 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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
7. CHECK FOR AN OPEN SEAT HEATER B(+) DRIVER FROM HSM TO SEAT BACK
NOTE: Check connectors - Clean and repair as necessary.
Measure the (P187) Left Seat Heater B(+) Driver circuit from the Seat Back connector to the HSM connector. Cavity 3 for LHD and 4 for RHD.
Is the resistance below 2.0 ohms?
Yes
- Replace the Heated Seat Module.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Repair the (P187) Left Seat Heater B(+) Driver circuit for an open back to the splice.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)