Fail-Safe Mode For Keyless Control Module And Steering Lock Unit (09-006/09)

WARNING: This page is about the 6 i Grand Touring, 2.5 A, Automatic, which is a different variant/trim than selected.

Publication date: 2009-01-30
Reference number: 09-006/09

FAIL-SAFE MODE FOR KEYLESS CONTROL MODULE AND STEERING LOCK UNIT

TECHNICAL SERVICE BULLETIN

Reference Number(s): 09-006/09, Date of Issue: 01/30/2009

MAZDA:

2009 MAZDA6

APPLICABLE MODEL(S) / VINS

2009 MAZDA6

DESCRIPTION

Vehicles equipped with Advance Keyless Entry have a theft Fail-Safe mode to ensure customer and vehicle safety. The system will prevent the engine from being started if any of the following DTCs are detected and either of these two (2) conditions are met:

Within 56 hours after the malfunction is detected.
When the push button start is switched to the ON position five (5) times or more.

Subject DTCs:

B100B:11_Steering lock unit ground circuit voltage less than threshold.
B100C:12_Steering lock unit power supply circuit voltage higher than threshold.
B1026:62_Keyless control module receives mismatched signal.
B1026:92_Keyless control module receives position signal indicating a serious malfunction.
U3000:49_Keyless control module internal malfunction.

The customer will also be notified via the instrument cluster warning light that there is a concern.

NOTE: If the customer suspects the vehicle is operating in fail-safe mode, advise the customer to immediately bring the vehicle to the dealer without shutting off the engine. If the engine is shut off, it may not restart.

NOTE: If the steering lock unit and/or keyless control module related harness are replaced during ANY repair, and the battery is not disconnected first, this may inadvertently induce one of the DTCs. The unexpected malfunction may cause the fail-safe mode to operate.

How to confirm if the vehicle is in fail-safe mode:

Depress the clutch pedal (MTX) or the brake pedal (ATX) while the ignition is OFF. If both lights turn red, the system may be in fail-safe mode.
If both lights turn red constantly when the ignition is in ACC or ON position, the system may be in fail-safe mode.

Fig 1: Keyless Warning Light

REPAIR PROCEDURE

Recovery procedure from fail-safe mode:

NOTE: If the negative battery cable is disconnected during the repair, be sure to record the customers pre-set radio stations first.

Verify concern.
Repair vehicle based on stored DTCs.
NOTE: Steps 3 - 7 below need to be completed within five (5) minutes.
Clear all DTC(s).
Turn ignition OFF.
Open and close driver's door.
Rotate steering wheel left or right and verify it is locked.
Start engine and verify no DTCs are present.
Re-enter customer's pre-set radio stations and perform "Power Window Initialization Procedure" as necessary.