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Symptom: *BRAKE LAMP SWITCH INOPERATIVE POSSIBLE CAUSES CHECK BRAKE LAMP SWITCH OUTPUT BRAKE LAMP SWITCH B+ OPEN BRAKE LAMP SWITCH OPEN BRAKE LAMP SWITCH OUTPUT CIRCUIT SHORT OR OPEN CAB -- INTERNAL OPEN TEST ACTION APPLICABILITY 1 With the DRBIII t in Inputs/Outputs, read the Brake Lamp Switch state. Press and release the brake pedal. t display PRESSED and RELEASED? All Yes → The Brake Lamp Switch is OK. Perform ABS VERIFICATION TEST - VER 1. No → Go To 2 2 Disconnect the Brake Lamp Switch harness connector. All Yes → Go To 3 No → Repair the Brake Lamp Switch Fused B+ circuit for an open. Perform ABS VERIFICATION TEST - VER 1. 3 Disconnect the Brake Lamp Switch harness connector. t in Inputs/Outputs, read the Brake Lamp Switch state. Does the DRBIII t display PRESSED? All Yes → Replace the Brake Lamp Switch in accordance with the Service Information. No → Go To 4 4 Disconnect the CAB harness connector. All Yes → Repair the Brake Lamp Switch Output circuit for a short to voltage or an open. No → Replace the Controller Antilock Brake in accordance with the Service Information. 37 BRAKES (CAB) |