Diagnostic trouble code (DTC) information

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Condition

Fig 1: Identifying Stop (Brake) Lamp Switch

Courtesy of VOLKSWAGEN UNITED STATES, INC.

The stop (brake) light switch informs the control module that braking is in progress.

The control module terminal is grounded via the stop (brake) lamp bulbs when the stop (brake) lamp switch is not activated. The control module (and bulbs) are supplied with battery voltage supply when the stop (brake) light switch is activated.

Diagnostic trouble code (DTC) ABS-142 is stored if the control module registers that the signal is too high (high voltage) continuously for 15 minutes. Diagnostic trouble code (DTC) ABS-142 is also stored if the control module registers that the signal ground via the light bulbs ceases when the stop (brake) lamp switch is unaffected for 15 minutes.

HINT: Consequently the diagnostic trouble code (DTC) can be stored if the brake pedal is depressed for more than 15 minutes with the ignition on. Fault causes of this type are not included in the fault-tracing procedure.

Substitute Value

The diagnostic trouble code (DTC) is stored without the ABS and EBD function being disengaged. If the fault occurs during ABS control, the ABS system is not disengaged until the ABS control has been cancelled.

Possible Source

Short-circuit to supply voltage in the signal cable
Open-circuit in the signal cable
Incorrectly adjusted stop (brake) lamp switch
Defective stop (brake) light switch
Defective bulbs in the stop (brake) lights
Contact resistance in the terminals.

Fault symptom[s]

The stop (brake) lamps are lit constantly
The bulb failure warning sensor is lit constantly
The stop (brake) lamps do not light up when the brake pedal is depressed.