Brake Warning System Diagnosis Brake Indicator Always On
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Does the brake indicator turn off? | -- | ||
2 | Ensure that the park brake warning switch is properly adjusted. Refer to Park Brake Cable Service/Adjustment . Is the adjustment OK? | -- | -- | |
3 | Replace the park brake warning switch. Is the replacement complete? | -- | System OK | -- |
4 | Disconnect the brake pressure warning switch connector (EBCM C4 connector). Does the brake indicator turn off? | -- | ||
5 |
Is the replacement complete? | -- | System OK | -- |
6 | Disconnect the electronic brake control module (EBCM) C1 connector. Does the brake indicator turn off? | -- | ||
7 | Replace the electronic brake control module (EBCM). Does the brake indicator work properly? | System OK | -- | |
8 | Disconnect the daytime running lamp (DRL) module connector. Does the brake indicator turn off? | |||
9 | Connect a self-powered test lamp to TAN/WHT (33) wire cavity F to ground. Does the test lamp light? | |||
10 | Locate and repair short to ground in TAN/WHT (33) wire between S129 and daytime running lamp (DRL) module. Does the brake indicator work properly? | System OK | -- | |
11 | Connect a self-powered test lamp to LT BLU (1134) wire cavity A to ground. Does the test lamp light? | |||
12 | Locate and repair short to ground in LT BLU (1134) wire between park brake warning switch and daytime running lamp (DRL) module. Does the brake indicator work properly? | System OK | -- | |
13 | Connect a self-powered test lamp to LT BLU (1134) wire cavity B to ground. Does the test lamp light? | |||
14 | Disconnect the steering column C201 connector. Does the test lamp light? | |||
15 | Replace the ignition switch. Does the brake indicator work properly? | System OK | -- | |
16 | Locate and repair short to ground in LT BLU (1134) wire between Ignition switch and daytime running lamp (DRL) module. Does the brake indicator work properly? | System OK | -- | |
17 | Replace the daytime running lamps (DRL) module. Does the brake indicator work properly? | -- | System OK | -- |
18 | With a test lamp backprobe the instrument cluster connector TAN/WHT (33) wire cavity A13 and ground. Does the test lamp light? | -- | ||
19 | Locate and repair short to ground in TAN/WHT (33) wire between instrument cluster and daytime running lamp (DRL) module. Does the brake indicator work properly? | -- | System OK | -- |
20 | Replace the instrument cluster. Does the lamp work properly? | -- | System OK | -- |
Brake Warning System Diagnosis Brake Indicator Inoperative
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Is the brake indicator inoperative with the parking brake engaged? | -- | ||
2 | Is the brake indicator inoperative when the ignition switch is cycled from the lock to run position (electronic brake control module (EBCM) initial self test)? | -- | ||
3 | Is the brake indicator inoperative when the hydraulic brake system has low brake pressure in the front or rear brakes? | -- | ||
4 | Is the brake indicator inoperative without an EBCM problem or low brake pressure in the front or rear? | -- | ||
5 | Is the brake indicator inoperative with the ignition switch in crank? | -- | ||
6 | Is the brake indicator inoperative while the ignition switch is in the bulb test position? | -- | ||
7 | Is the brake indicator inoperative without the ignition switch in crank or the parking brake engaged (W/DRL only)? | -- | ||
8 | Is the brake indicator completely inoperative? | -- | -- | |
9 |
Does the brake indicator light? | -- | ||
10 |
Does the brake indicator light? | -- | System OK | -- |
11 | Locate and repair open in LT BLU (1134) wire between daytime running lamp module and park brake warning switch. Does the brake indicator light? | -- | System OK | -- |
12 |
Does the brake indicator light? | -- | Go to Four Wheel Antilock Brake System Diagnosis | |
13 | Locate and repair open in PPL (680) wire between splice S129 and electronic brake control module (EBCM). Does the brake indicator light? | |||
14 |
Does the brake indicator light? | -- | System OK | -- |
15 |
Does the brake indicator work properly? | -- | ||
16 | Locate and repair open in PPL (680) wire between splice S129 and brake pressure warning switch. Does the brake indicator light? | -- | System OK | -- |
17 |
Is there continuity? | -- | System OK | -- |
18 |
Does the test lamp light? | -- | ||
19 | Locate and repair open in PPL (680) wire between underhood fuse-relay center and splice S129. Does the brake indicator work properly? | -- | ||
20 | Replace diode II (D100). Does the brake indicator work properly? | -- | System OK | -- |
21 | Locate and repair open in TAN/WHT (33) wire between daytime running lamp module and underhood fuse-relay center. Does the brake indicator work properly? | -- | System OK | -- |
22 |
Does the test lamp light? | -- | System OK | -- |
23 | Locate and repair open in LT BLU (1134) wire between daytime running lamp module and C201 connector. Does the brake indicator work properly? | -- | ||
24 | Replace the ignition switch. Does the brake indicator work properly? | -- | System OK | -- |
25 |
Does the brake indicator light? | -- | System OK | -- |
26 | Replace the ignition switch. Does the brake indicator work properly? | -- | ||
27 | Locate and repair open in LT BLU (1134) wire between daytime running lamp module and ignition switch. Does the brake indicator light? | -- | System OK | -- |
28 |
Does the test lamp light? | -- | System OK | -- |
29 | Locate and repair open in TAN/WHT (33) wire between instrument cluster and daytime running lamp module. If OK, replace the instrument cluster. Does the brake indicator work properly? | -- | ||
30 | Locate and repair open in PNK (39) wire between I/P fuse block and instrument cluster. Does the brake indicator work properly? | -- | System OK | -- |
31 | Replace in-harness diode D200. Does the brake indicator light? | -- | System OK | -- |
