B1786

B1786-STOP LAMP CONTROL CIRCUIT OPEN





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

- When Monitored:
With the Stop Lamps Activated.

- Set Condition:
When the Totally Integrated Power Module (TIPM) detects an open condition in the brake lamp switch output circuit.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all TIPM DTCs.
3. Turn the Stop Lamps on.
4. With the scan tool read the DTC information.

Does the scan tool read: B1786-STOP LAMP CONTROL CIRCUIT OPEN?

Yes

- Go To 2

No

- The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. STOP LAMP BULBS
1. Turn the ignition off.
2. Inspect the Left and Right Stop Lamp Bulb Assemblies.

Are the inoperative bulbs OK?

Yes

- Go To 3

No

- Replace the Inoperative bulb or bulbs.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. (L50) BRAKE LAMP SWITCH OUTPUT CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the TIPM C6 harness connector.
3. Disconnect the Left and Right Stop Lamp harness connectors.
4. Measure the resistance of the (L50) Brake Lamp Switch Output circuit.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (L50) Brake Lamp Switch Output circuit for an open condition.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Totally Integrated Power Module (TIPM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.