HandsFreeLink(R) - Whine From Audio Speakers

07-013

March 2, 2007

Applies To:
2007 TL with Navigation System - ALL

Whine From Speakers During HFL Use

SYMPTOM

With the engine running, a high-pitched whine comes from the audio system speakers when you press the HFL (HandsFreeLink(TM) Talk button on the steering wheel. Increasing the engine rpm increases the whine's pitch, and increasing the audio system volume increases the whine's volume. The whine stops when you press the HFL Back button on the steering wheel.

PROBABLE CAUSE

A ground wire to the HFL control unit connector transmits electrical noise from other vehicle systems to the audio speakers.

CORRECTIVE ACTION

Cut the YEL ground wire near the HFL control unit connector, and insulate the cut ends with electrical tape.

WARRANTY CLAIM INFORMATION

In warranty:
The normal warranty applies.

Operation Number: 7370C4

Flat Rate Time: 0.3 hour

Failed Part: P/N 39770-SEP-A11ZA

Defect Code: 06403

Symptom Code: 04201

Template ID: 07-013A

Skill Level: Repair Technician

Out of warranty:
Any repair performed after warranty expiration may be eligible for goodwill consideration by the District Parts and Service Manager or your Zone Office. You must request consideration, and get a decision, before starting work.

REPAIR PROCEDURE





1. Carefully pry the moonroof switch out of the roof console, and disconnect its 7P connector.





2. Carefully pry the map light lenses out of the roof console.





3. Grab the roof console between the moonroof switch opening and either map light, then pull down to release the clip. Remove the roof console, and disconnect the 20P connector.





4. Remove the four bolts that secure the roof console bezel to its mounting bracket.





5. Lower the bezel, and disconnect the HFL control unit 28P connector.





6. Peel back the HFL connector harness tape about 2 inches. Locate the YEL wire in the HFL control unit connector (terminal cavity No. 28).





7. Cut the YEL wire about 2 inches from the end of the connector.

8. Insulate the cut wire ends and the wire harness with electrical tape:

^ Tape the cut wire ends.

^ Bend back the harness side of the cut wire, and tape it to the harness.

^ Tape the connector side of the cut wire to the harness wires.





^ Reattach the tape you peeled back in step 6.

9. Reinstall the parts in the reverse order of removal.

10. Make sure the map lights work.

11. Turn the ignition switch to ON (II), then make sure the moonroof works properly.

12. Press OK on the navigation system screen, then make sure the Talk buttons for the navigation and the HFL systems work properly.





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