Circuit/System Testing

Ignition OFF, disconnect the harness connector at the A22 Radio Controls.
Test for less than 10 Ω between the ground circuit terminal 8 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
Test for less than 20 Ω between the data shield circuit terminal 7 and ground.
- If 20 Ω or greater
1. Ignition OFF, disconnect the X1 connector at the A11 Radio.
2. Test for less than 2 Ω in the data shield circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the A11 Radio.
- Go to next step: If less than 20 Ω
Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. 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, refer to Power Mode Mismatch .
- If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. 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 A22 Radio Controls.
- Go to next step: If the test lamp illuminates.
Ignition ON.
Test for 2 - 3 V between the serial data circuit terminals listed below and ground.
- terminal 5
- terminal 6
- If less than 2 V
1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
2. Test for infinite resistance between the affected serial data circuit(s) 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 serial data circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the A11 Radio.
- If greater than 3 V
1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio. Ignition ON.
2. Test for less than 1 V between the serial data circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the A11 Radio.
- Go to next step: If between 2 - 3 V
Test for less than 1 V between the control circuit terminals listed below and ground.
- terminal 3
- terminal 4
- If greater than 1 V
1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio. Ignition ON.
2. Test for less than 1 V between the affected control circuit(s) and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the A11 Radio.
- Go to next step: If less than 1 V
Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
Test for infinite resistance between the control circuit terminals listed below and ground.
- A22 Radio Controls terminal 3
- A22 Radio Controls terminal 4
- If less than infinite resistance,
  Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
Test for less than 2 Ω between the control circuits listed below.
- A22 Radio Controls terminal 3 and the A11 Radio terminal 13 X1
- A22 Radio Controls terminal 4 and the A11 Radio terminal 27 X1
- If 2 Ω or greater
  Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 Ω.
Replace the A22 Radio Controls. Connect all harness connectors.
Ignition ON, radio ON.
Verify that all radio controls operate and perform the correct function.
- If the radio controls still malfunction.
  Replace the A11 Radio.
- Go to next step: If all radio controls operate and perform the correct function.
All OK