Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Important: Verify that the park brake lever is fully released and that there are no leaks or air in the hydraulic brake system. Also, verify that there is proper battery voltage present. | ||||||||||
1 | Did you review the brake warning system operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms | ||||||
2 | Verify that the brake warning indicator is always on. Is the brake warning indicator operating normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||||
3 |
Are all of the modules communicating with the scan tool? | -- | Go to Step 4 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | ||||||
4 | Use the scan tool in order to inspect for DTCs in the above listed modules and Instrument Cluster. Are any DTCs present? | -- | Go to the appropriate DTC Diagnostic | Go to Step 5 | ||||||
5 | Use the scan tool to monitor the park brake indicator switch input 1 to the BCM. Does the switch change state between set and released during operation of the park brake lever? | -- | Go to Step 9 | Go to Step 6 | ||||||
6 | Disconnect the park brake indicator switch. Is the brake warning lamp still ON? | -- | Go to Step 7 | Go to Step 8 | ||||||
7 | Repair the short to ground in CKT 1134 (LT BLU) between the park brake indicator switch and the BCM. Is the repair complete? | -- | Go to Step 15 | -- | ||||||
8 | Replace the park brake indicator switch. Is the repair complete? | -- | Go to Step 15 | -- | ||||||
9 | Use the scan tool to verify if the brake pressure warning switch state is OK or LOW. Is the brake pressure differential switch state LOW? | -- | Go to Step 10 | Go to Step 13 | ||||||
10 | Disconnect the brake pressure differential switch. Is the brake warning lamp still ON? | -- | Go to Step 11 | Go to Step 12 | ||||||
11 | Repair the short to ground in CKT 680 (PPL) between the brake pressure differential switch and the EBCM. Is the repair complete? | -- | Go to Step 15 | -- | ||||||
12 | Replace the brake pressure differential switch. Is the repair complete? | -- | Go to Step 15 | -- | ||||||
13 | Use the scan tool to turn the brake warning lamp on and off. Does the lamp turn on and off? | -- | Go to Step 15 | Go to Step 14 | ||||||
14 | Replace the instrument cluster. Refer to Instrument Cluster Lens Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Step 15 | -- | ||||||
15 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 | ||||||
