Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open. | ||||
1 | Disconnect the brake switch connector C1. Do the lamps remain lit? | -- | Go to Step 2 | Go to Step 3 |
2 | Disconnect connector C3 of the left IP junction block. Do any of the stop lamps remain lit? | -- | Go to Step 4 | Go to Step 5 |
3 | Inspect the adjustment of the stoplamp switch. If the adjustment is OK, replace the stoplamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Is the repair complete? | -- | -- | |
4 | Repair the short to B+ in CKT 20 between the left IP junction block and the lit lamp. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
5 | Connect a test lamp between connector C3 terminal A12 of the left IP junction block and ground. Does the test lamp light? | -- | Go to Step 6 | Go to Step 7 |
6 | Repair the short to B+ in CKT 20 between the left IP junction block and the brake switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
7 |
Do the stop lamps remain lit? | -- | Go to Step 8 | Go to Step 9 |
8 | Replace the left IP junction block. Is the repair complete? | -- | -- | |
9 |
Do the stop lamps remain lit? | -- | Go to Step 10 | Go to Step 11 |
10 | Repair the short to B+ in CKT 20 between the left IP junction block and the underhood junction block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
11 |
Does the test lamp light? | -- | Go to Step 12 | Go to Step 13 |
12 |
Does the test lamp light? | -- | Go to Step 14 | Go to Step 15 |
13 |
Does the test lamp light? | -- | Go to Step 16 | Go to Step 17 |
14 | Repair the short to B+ in CKT 20 between the underhood junction block and the EBCM. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
15 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement in Antilock Brakes. Is the repair complete? | -- | -- | |
16 |
Does the test lamp light? | -- | Go to Step 18 | Go to Step 19 |
17 | Replace the underhood junction block. Refer to Underhood Fuse Block Replacement in Engine Electrical. Is the repair complete? | -- | -- | |
18 | Repair the short to B+ in CKT 20 between the underhood junction block and the cruise control module. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
19 | Replace the cruise control module. Refer to Cruise Control Module Replacement in Cruise Control. Is the repair complete? | -- | -- | |
