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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Power Liftgate Control Module >> DTC B126A-62; Front Door Lock-Link Switch (LH) Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT FRONT DOOR LATCH AND LOCK ACTUATOR (LH) CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the front door latch and lock actuator (LH) connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
 Yes Go to the next step.
No Repair or replace the connector, then go to Step 6.
2 INSPECT FRONT DOOR LOCK-LINK SWITCH (LH) GROUND CIRCUIT FOR OPEN CIRCUIT
  • Verify that the front door latch and lock actuator (LH) connector is disconnected.
  • Inspect for continuity between front door latch and lock actuator (LH) terminal J (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between front door latch and lock actuator (LH) terminal J and body ground.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

    Go to Step 6.
3 INSPECT FRONT DOOR LOCK-LINK SWITCH (LH) Yes Go to the next step.
No Replace the front door latch and lock actuator (LH), then go to Step 6.
(See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION .)
4 INSPECT POWER LIFTGATE (PLG) CONTROL MODULE CONNECTOR CONDITION
  • Disconnect the power liftgate (PLG) control module connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
 Yes Go to the next step.
No Repair or replace the connector, then go to Step 6.
5 INSPECT FRONT DOOR LOCK-LINK SWITCH (LH) UNLOCK CIRCUIT FOR OPEN CIRCUIT
  • Verify that the power liftgate (PLG) control module and front door latch and lock actuator (LH) connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Front door latch and lock actuator (LH) terminal D-Power liftgate (PLG) control module terminal 1U
      • Front door latch and lock actuator (LH) terminal B-Power liftgate (PLG) control module terminal 1V
  • Is there continuity?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Front door latch and lock actuator (LH) terminal D-Power liftgate (PLG) control module terminal 1U
  • Front door latch and lock actuator (LH) terminal B-Power liftgate (PLG) control module terminal 1V

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

    Go to the next step.
6 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
No Go to the next step.
7 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [POWER LIFTGATE (PLG) CONTROL MODULE] .)
No DTC troubleshooting completed.
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