Stop Lamps Inoperative Pickup
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: This diagnostic should only be used if all brake lamps are inoperative. | ||||
1 | Did you perform the Exterior Lights System Check? | -- | Go to Step 2 | |
2 | Disconnect the Stop, TCC, and Cruise Switch. Measure voltage at pin B of the connector. Was voltage present? | V | Go to Step 4 | Go to Step 3 |
3 | Repair open in Ckt 140 (ORN). Refer to Wiring Repairs in Wiring Systems. Is repair complete? | -- | -- | |
4 | Depress the Brake pedal while measuring continuity from pin A to pin B of the connector. Is conitnuity present? | ohms | Go to Step 6 | Go to Step 5 |
5 | Replace the Stop, TCC, and Cruise Switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes Is the repair complete? | -- | -- | |
6 |
Is voltage present? | V | Go to Step 8 | Go to Step 7 |
7 | Repair open in Ckt 17 (WHT). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
8 |
Measure voltage at pin E2 of the Directional Signal Connector. Is voltage present? | V | Go to Step 9 | Go to Step 10 |
9 | Replace the Directional Signal Switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering. Is the repair complete? | -- | -- | |
10 | Inspect for an open in Ckt 20 (LT BLU). Refer to Wiring Repairs in Wiring Systems Was an open found? | -- | Go to Step 11 | Go to Step 12 |
11 | Repair the open in Ckt 20 (LT BLU). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
12 | Replace the Brake Lamp Relay. Is the repair complete? | -- | -- | |
Stop Lamps Inoperative Suburban/Utility
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: This diagnostic is only to be used when the rear stop lamps are all inoperative. | ||||
1 | Was the Exterior Lights System Check performed? | -- | Go to Step 2 | |
2 | Disconnect the Stoplamp, TCC, and Cruise Control Switch Connector. Measure voltage at pin B. Was there voltage? | V | Go to Step 4 | Go to Step 3 |
3 | Repair the open in CKT 140 (ORN). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
4 | Depress the Brake pedal and measure continuity across Pin A and Pin B. Was there continuity? | ohms | Go to Step 6 | Go to Step 5 |
5 | Replace the Stoplamp, TCC, and Cruise Control Switch. Is the repair complete? | -- | -- | |
6 |
Measure voltage at A1 of the connector Was voltage present? | V | Go to Step 8 | Go to Step 7 |
7 | Repair the open in CKT 17 (WHT). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
8 | Replace the Directional Signal Switch. Is the repair complete? | -- | -- | |
