Checking the power supply

Check the power supply to the stop lamp switch. Take readings between stop lamp switch terminal #1 (cable harness side) and the ground terminal. The power supply must be approximately 12 V.

If there is no power supply: 

Check the power supply circuit for stop lamp switch terminal #1 (cable harness side). Check for an open-circuit. Check for a short-circuit to ground. Check for a blown fuse in the circuit.

Remedy as necessary.

Other information: 

• For further information about the fuses and relays, see the Wiring Diagram
• See Connecting the breakout box
• For information about signals for 5 cylinder engines: Signal specification 
• See Stop lamp switch, replacing
• See Contents

Fig 2: Identifying 10-Bit Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Brake Pedal Position Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Checking components and wiring