STEP 1. Resistance measurement at hands free module connector (GND terminal).
(1) Disconnect hands free module connector, and measure at the wiring harness side.
(2) Check the continuity between GND terminal and ground.OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 3 Go to Step 2
STEP 2. Check of open circuit in GND line between hands free module connector and ground.
STEP 3. Voltage measurement at hands free module connector (+B terminal).
(1) Disconnect hands free module connector, and measure at the wiring harness side.
(2) Measure the voltage between +B terminal and ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 5 Go to Step 4
STEP 4. Check of short to power supply, short to ground, and open circuit in +B line between fusible link and hands free module connector.
STEP 5. Voltage measurement at hands free module connector (ACC terminal).
(1) Disconnect hands free module connector, and measure at the wiring harness side.
(2) Turn the ignition switch to "ACC" position.
(3) Measure the voltage between ACC terminal and ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Replace the hands free module. Go to Step 6
STEP 6. Check of short to power supply, short to ground, and open circuit in ACC line between hands free module connector and radio and CD player connector.
Is the check result normal?
Replace the radio and CD player. Repair the connector(s) or wiring harness.