B1439-PHONE SWITCH STUCK

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
The Hands Free Module detects voltage between 2.8 volts and 3.3 volts on the (X730) Voice Recognition/Phone Switch Signal circuit for more than 30 seconds.

Possible Causes

INSIDE REAR VIEW MIRROR

HANDS FREE MODULE

Diagnostic Test

1.CHECK FOR ACTIVE DTCS

Does the scan tool display this DTC as active?

Yes

Go To 2

If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

2.CHECK THE VOLTAGE OF THE (X730) VOICE RECOGNITION/PHONE SWITCH SIGNAL

NOTE: The scan tool sensor voltage should switch from above 4.7 volts when the jumper is not connected to below 0.6 volts when the jumper is connected.

Does the sensor voltage switch from above 4.7 volts to below 0.6 volt as described?

Yes

Replace the Inside Rear View Mirror in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Hands Free Module in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).