Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Does the brake indicator remain on? | -- | ||
2 | Disconnect the brake pressure warning switch connector. Does the brake indicator remain on? | -- | ||
3 | Is the park brake warning switch properly adjusted? | -- | -- | -- |
4 | Disconnect electronic brake control module. Does the brake indicator remain on? | -- | ||
5 | Refer to brake system testing for diagnosis of the hydraulic brake system. Does the brake indicator run correctly? | -- | System OK | -- |
6 | Disconnect the truck body control module. Does the brake indicator remain on? | -- | Go to Step 8 | |
7 | Refer to 4 WD antilock brake system diagnosis. Does the brake indicator run correctly? | -- | System OK | -- |
8 |
Does the test lamp light? | -- | ||
9 |
Does the test lamp light? | -- | ||
10 | Locate and repair open in ORN(240) wire between instrument cluster cavity A10 IP fuse block. | -- | System OK | -- |
11 | Replace instrument cluster printed circuit board. Does the brake indicator turn off? | -- | System OK | -- |
12 | Locate and repair open in LT BLU(1134) wire between truck body control module connector C1 cavity B10 and park brake warning switch cavity A. | -- | System OK | -- |
13 |
Does the test lamp light? | -- | ||
14 | Locate and repair upon between electronic brake control module C2 cavity A and IP fuse block. | -- | System OK | -- |
15 |
Does the test lamp light? | -- | ||
16 | Locate and repair open in PPL(680) wire between the electronic brake control module connector C2 cavity H and the brake pressure warning switch cavity B. | -- | System OK | -- |
17 |
Does the test lampp light? | -- | ||
18 | Locate and repair open in BLK(350) wire between brake pressure warning switch and ground G102. | -- | System OK | -- |
19 | Replace brake pressure warning switch. | -- | System OK | -- |
