Various Electrical System Malfunctions DTC B10E7 – 2013-2015 Mazda CX-5

2013-2015 CX-5 – VARIOUS ELECTRICAL SYSTEM MALFUNCTION(S) RELATED TO C-15 CONNECTOR CORROSION

APPLICABLE MODEL(S)/VINS

2013-2015 CX-5 vehicles with VINs lower than JM3KE******554564 (produced before Nov. 24, 2014)

 

Vehicles may experience one or more of the following symptoms in connection with a malfunction related to the C-15 connector.

  • The driver side power window does not operate.
  • The door does not open when using the advanced keyless system.
  • The warning lamp stays ON even after the ignition switch is turned OFF.
  • DTC B10E7:17 (START STOP UNIT, IG1 Relay Circuit Malfunction) and DTCs related to communication errors may be stored in PCM memory.

 

C-15 connector

 

The symptoms listed above may be caused by corrosion of the C-15 connector terminals due to water intrusion through the front door.

In low ambient temperatures, the door harness hardens.

If the door is fully opened, it may create a gap between the door and the door harness grommet, which may allow water to enter through the gap.

 

MASS PRODUCTION CHANGES:

  • The front door harness grommet has been changed to improve sealing performance.
  • Holes inside the front pillar (which are made for weight reduction), have been covered to prevent water intrusion.
  • The C-15 connector has been improved.

 

REPAIR PROCEDURE

OUTLINE:

If one or more of the above mentioned symptoms can be confirmed, disconnect the C-15 connector (which joins the door harness and the rear harness). Inspect for any signs of corrosion of the C-15 connector terminals referring to the inspection procedure below.

  • If there is any corrosion at the C-15 connector, replace the door harness and repair the rear harness according to the following repair procedure.
  • If there is no corrosion found at the C-15 connector, this bulletin is not applicable. Troubleshoot the concern(s) according to the MS3 online instructions or the Workshop Manual.

 

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