B1085

B1085-LEFT HEATED SEAT SWITCH INPUT CIRCUIT LOW





For a complete wiring diagram refer to Diagrams/Electrical.

- When Monitored: Ignition on, during the heated seat operation.
- Set Condition: This code is set immediately after the Cluster detects the heated seat switch MUX circuit low.





Diagnostic Test

1.VERIFY THAT DTC B1085-LEFT HEATED SEAT SWITCH INPUT 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 B1085 LEFT HEATED SEAT SWITCH INPUT 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. Body Verification Test

2.INSPECT JUNCTION BLOCK FUSE No. 2

Check the Junction Block Fuse No. 2.

Is the fuse open?

Yes

- Check for a possible short to ground on the (F21) Fused Ignition Switch Output Circuit and replace the fuse as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3.DISCONNECT THE CLUSTER C-1 CONNECTOR AND CHECK FOR VOLTAGE





Reinstall the fuse if removed in previous test.

Disconnect the Cluster C-1 connector.

NOTE: Check connectors - Clean and repair as necessary.

Turn the ignition on.

Measure the voltage at the (P7) Driver Heated Seat Switch MUX circuit at the Cluster C-1 connector.

Is the voltage above 10.0 volts?

Yes

- Replace the Cluster.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 4

4.CHECK THE (F21) FUSED IGNITION SWITCH OUTPUT (RUN-START)





Disconnect the Driver Heated Seat switch connector.

NOTE: Check connectors - Clean and repair as necessary.

Turn the ignition on.

Measure the voltage of the (F21) Fused Ignition Switch Output circuit at the Driver Heated Seat Switch connector.

Is the voltage above 10.0 volts ?

Yes

- Go To 5

No

- Repair the (F21) Fused Ignition Switch Output circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

5.CHECK THE (P7) DRIVER HEATED SEAT SWITCH MUX CIRCUIT FOR A SHORT TO GROUND





Measure the resistance between ground and the (P7) Driver Heated Seat Switch MUX circuit.

Was the resistance below 5.0 ohms?

Yes

- Repair the (P7) Driver Heated Seat Switch MUX circuit for a short to ground
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 6

6.CHECK THE (P7) DRIVER HEATED SEAT SWITCH MUX CIRCUIT FOR AN OPEN





Measure the resistance of the (P7) Driver Heated Seat Switch MUX circuit between the Cluster C-1 connector and the Driver Heated Seat Switch connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the Driver Heated Seat Switch.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Repair the (P7) Driver Heated Seat Switch MUX circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test