Circuit/System Testing

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector:X1 @ A11 Radio
Engine Running @ 600 RPM
Test for 575 to 800 Hz between the test points:Signal circuit terminal 23 & Ground
- If not between 575 and 800 Hz
1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points:Signal circuit terminal 23 & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - Go to next step: If less than 1 V
5. Ignition/Vehicle & All vehicle systems - Off
6. Test for infinite resistance between the test points:Signal circuit terminal 23 & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
7. Test for less than 2 ohms between the test points:Signal circuit terminal 23 & The other end of the circuit
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component:K20 Engine Control Module
- Go to next step: If between 575 and 800 Hz
Test or replace the component:A11 Radio