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Home >> Volvo >> 1993 >> 850 Automatic >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brake System & Traction Control System >> Diagnosis & Testing >> Abs/TRACS Diagnostic Trouble Code Tests >> Code 1-4-2: Faulty Brake Light Switch, Open Or Short Circuit
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Code 1-4-2: Faulty Brake Light Switch, Open Or Short Circuit

  1. Check if brakelight works. If brakelight does not work, check bulb and wiring as necessary. If brakelight works, connect test box to control unit. See USING TEST BOX (981 3190) under SELF-DIAGNOSIS. Connect voltmeter between test box terminals No. 32 and 1. Depress brake pedal. If voltmeter indicates battery voltage, erase code and test drive vehicle. See TEST DRIVING VEHICLE. If code occurs again, replace control module. If voltmeter does not indicate battery voltage, go to next step and check if circuit is open or shorted.
  2. Remove 2 wires (Red and Yellow wires) from brakelight switch. Connect voltmeter between Red wire and ground. If battery voltage is present, go to next step. If battery voltage is not present, check wiring or fuse for an open circuit.
  3. Connect a jumper wire between Red and Yellow wires. If brakelight lights, ensure brakelight switch is adjusted correctly. If switch is adjusted correctly, replace switch. If brakelight does not light, ensure wiring to brakelight bulbs is okay.
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