Circuit / System Testing

Circuit / System Testing DTC B1D71 49, 87

Ignition / Vehicle - Off
Disconnect the A22 Radio Control harness connector.
Verify a test lamp illuminates between the ground circuit terminal and B+.
- If the test lamp does not illuminate
  Repair the open / high resistance in the ground circuit.
- Go to next step: If the test lamp illuminates
Ignition ON / Vehicle In Service Mode.
Verify a test lamp illuminates between the B+ circuit terminal and ground.
- If the test lamp does not illuminate and the circuit fuse is good
1. Test for an open / high resistance in the B+ circuit.
  - If an open / high resistance is found, repair the fault in the circuit.
  - Go to next step: If an open / high resistance is not found
2. 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 a short to ground in the B+ circuit.
  - If a short to ground is found, repair the fault in the circuit.
  - Go to next step: If a short to ground is not found
2. Replace the A22 Radio Control.
- Go to next step: If the test lamp illuminates
Verify the LVDS / USB cable is properly connected at all components and in-line connections, and there is no damage to the cable or connections.
- If connection problems or cable damage is noted.
  Perform the appropriate repair or replacement to correct any issues.
- Go to next step: If no connection problems or cable damage is noted.
Replace the LVDS / USB cable.
Ignition - On / Vehicle - In Service Mode
Verify DTC is not set.
- If DTC sets
1. Replace the A22 Radio Control.
2. Verify the DTC is not set.
  - If DTC sets
    Replace the A11 Radio.
  - Go to next step: If DTC is not set
    Go to next step: All OK
- Go to next step: If DTC is not set
All OK

Circuit / System Testing B1D71 04, 98

Ignition ON / Vehicle In Service Mode.
Verify the DTC is not set.
- If DTC is set
  Replace the component: A22 Radio Control
- Go to next step: If DTC is not set
All OK