Circuit/System Testing

Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, open and close drivers door, disconnect the harness connector at the S3 Transmission Shift Lever. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 2 and ground.
- If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, repair the open/high resistance in the ground connection.
- Go to next step: If less than 10 Ω
Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 2.
Verify the test lamp turns ON and OFF when applying and releasing the brake pedal.
- If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the B103 Stop Lamp Switch.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
3. Test for less than 2 Ω in the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - Go to next step: If less than 2 Ω
4. Ignition ON
5. Verify a test lamp illuminates between the ignition circuit terminal at the B103 Stop Lamp Switch.
  - If the test lamp does not illuminate, repair the circuit or fuse as necessary.
  - If the test lamp illuminates at the ignition circuit, replace the B103 Stop Lamp Switch.
- If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the B103 Stop Lamp Switch, ignition ON.
2. Test for less than 1 V between the control circuit terminal and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the B103 Stop Lamp Switch.
- Go to next step: If the test lamp turns ON and OFF
Test or replace the S3 Transmission Shift Lever.