Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the X3 harness connector at the A11 Radio. 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 20 and ground.
- If 10 Ω or greater
1. 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
Verify a test lamp illuminates between the B+ circuit terminal 19 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
1. Test for less than 2 Ω in the B+ circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
- If the test lamp does not illuminate and the circuit fuse is open
1. Test for infinite resistance between the B+ circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the A11 Radio.
- Go to next step: If the test lamp illuminates
Ignition ON.
Verify a test lamp illuminates between the ignition circuit terminal 7 and ground.
- If the test lamp does not illuminate
1. Ignition OFF.
2. Test for less than 2 Ω in the ignition circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, refer to Vehicle Will Not Change Power Mode .
- Go to next step: If the test lamp illuminates
If all circuits test normal, replace the A11 Radio.