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Symptom: *BRAKE LAMP SWITCH POSSIBLE CAUSES CHECK BRAKE LAMP SWITCH OUTPUT BRAKE LAMP SWITCH B+ OPEN BRAKE LAMP SWITCH OUTPUT CIRCUIT SHORT OR OPEN BRAKE LAMP SWITCH 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. No → 2 Disconnect the Brake Lamp Switch harness connector. All Yes → No → Repair the Brake Lamp Switch Fused B+ circuit for an open. 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 No → 4 Disconnect the CAB harness connector. All Yes → Repair the Brake Lamp Switch Output circuit for a short to No → Replace the Controller Anti-Lock Brake in accordance with the 59 BRAKES (CAB) |