Car not starting

Hi,

It sounds like there is an issue with the keyless control module. There was a technical service bulletin put out regarding this issue. The only way to be sure is to have the computer scanned to determine which diagnostic trouble code is stored.

Here is the TSB I referred to:

2009 Mazda 6 L4-2.5L
Keyless Systems - Hard Start/DTC B100B:11/B100C:12/U3000
Vehicle Starting and Charging Starting System Keyless Starting System Keyless Start Control Module Technical Service Bulletins Keyless Systems - Hard Start/DTC B100B:11/B100C:12/U3000
KEYLESS SYSTEMS - HARD START/DTC B100B:11/B100C:12/U3000
Bulletin No: 09-014/09

Last Issued: 03/18/2009

Subject:
ENGINE HARD TO START - KEYLESS CONTROL MODULE

APPLICABLE MODEL(S) / VINS
2009 MAZDA6

DESCRIPTION

Vehicles equipped with Advanced Keyless Entry that have DTCs B100B:11, B100C:12, or U3000:49 stored in memory and the keyless module goes into fail-safe mode, may be hard to start.

B100B:11_Steering lock unit ground circuit voltage less than threshold.

B100C:12_Steering lock unit power supply circuit voltage higher than threshold.

U3000:49_Keyless control module internal malfunction.

In some cases the keyless unit misdiagnoses a signal from the steering lock unit. When this happens, the keyless control module goes into fail-safe mode, and may cause the engine to be hard to start.

Pic 1

NOTE:
If the vehicle goes into fail-safe mode, the red keyless warning light and the red push button start indicator light come on together. For more details of fail-safe mode, refer to Service Bulletin 09-006/09 "FAIL-SAFE MODE FOR KEYLESS CONTROL MODULE AND STEERING LOCK UNIT".

The keyless control module software has been changed at mass-production to eliminate this concern.

Customers having this concern should have their vehicle repaired using the following repair procedure.

REPAIR PROCEDURE

1. Verify concern.

2. Record customer's pre-set radio stations.

3. Disconnect negative battery cable.

4. Replace keyless control module according to Workshop Manual (section 09-14 KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM]).

5. Re-enter customer's pre-set radio stations.

6. Perform "Power Window Initialization Procedure" to restore power window functions.

Pic 2

PART(S) INFORMATION

pic 3

WARRANTY INFORMATION

NOTE:
This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.

This repair will be covered under Mazda's New Vehicle Limited Warranty term.

Additional diagnostic time cannot be claimed for this repair.

Let me know if this helps.

Joe