Voice Recognition/Phone Switch Circuit Shorted to Ground

VOICE RECOGNITION/PHONE SWITCH CIRCUIT SHORT TO GROUND

Voice Recognition/Phone Switch Circuit Short To Ground:

WHEN MONITORED
With the ignition on.

SET CONDITION
The Hands Free Module detects voltage below 0.6 volts on the (X730) Voice Recognition/Phone Switch Signal circuit.

POSSIBLE CAUSES
- (X730) voice recognition/phone switch signal circuit short to (X835) sensor ground circuit
- (X730) voice recognition/phone switch signal circuit short to ground
- Automatic day/night mirror
- Hands free module

DIAGNOSTIC TEST

1. CHECK FOR ACTIVE DTC
Turn the ignition on.
With the scan tool, erase the HFM DTCs.
Attempt to make a phone call using the system.
With the scan tool, read the HFM DTCs.

Q: Did this DTC reset?

YES: Go To 2
NO: The condition that set this DTC is no longer present. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.

2. CHECK THE VOLTAGE OF THE (X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL
Turn the ignition off.
Disconnect the Automatic Day/Night Mirror C2 harness connector.
Turn the ignition on.
With the scan tool, monitor the VR Phone Switch voltage.

Q: Is the voltage above 4.7 volts?

YES: Replace the Automatic Day/Night Mirror.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. (X730) VOICE/RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT SHORTED TO THE (X835) SENSOR GROUND CIRCUIT




Turn the ignition off.
Disconnect the Hands Free Module C1 harness connector.
Measure the resistance between the (X730) Voice Recognition/Phone Switch Signal circuit and the (X835) Sensor Ground circuit.

Q: Is the resistance below 100.0 ohms?

YES: Repair the (X730) Voice Recognition/Phone Switch Signal circuit for a short to the (X835) Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 4

4. (X730) VOICE/RECOGNITION/PHONE SWITCH SIGNAL CIRCUIT SHORTED TO GROUND




Measure the resistance between ground and the (X730) Voice Recognition/ Phone Switch Signal circuit.

Q: Is the resistance below 100.0 ohms?

YES: Repair the (X730) Voice Recognition/Phone Switch Signal circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands Free Module.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test