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Home >> Mazda >> 2023 >> CX-9 Signature >> Repair and Diagnosis >> Body & Frame >> Door Locks >> On-Board Diagnostic - Power Liftgate Control Module >> DTC B1453-02: Latch Switch Circuit Malfunction[Power Liftgate (PLG) Control Module] >> Diagnostic Procedure
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Diagnostic Procedure

DTC B1453:02 [POWER LIFTGATE (PLG) CONTROL MODULE] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT POWER LIFTGATE (PLG) LATCH SWITCH CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the negative battery terminal.

    (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)

  • Disconnect the power liftgate (PLG) latch switch 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 8.
2 INSPECT POWER LIFTGATE (PLG) LATCH SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT
  • Verify that the power liftgate (PLG) latch switch connector is disconnected.
  • Inspect for continuity between power liftgate (PLG) latch switch terminal C (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Go to the next step.
No Refer to appropriate wiring diagram and verify whether or not there is a common connector between power liftgate (PLG) latch switch terminal C 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 8.
3 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 8.
4 IINSPECT POWER LIFTGATE (PLG) LATCH SWITCH CIRCUIT FOR SHORT TO GROUND
  • Verify that the power liftgate (PLG) latch switch and power liftgate (PLG) control module connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Power liftgate (PLG) latch switch terminal B
    • Power liftgate (PLG) latch switch terminal D
  • Is there continuity?
 Yes Refer to appropriate wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Power liftgate (PLG) latch switch terminal B-Power liftgate (PLG) control module terminal 1Q
  • Power liftgate (PLG) latch switch terminal D-Power liftgate (PLG) control module terminal 1O

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 a short to ground.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has a short to ground.

Go to Step 8.
No Go to the next step.
5 INSPECT POWER LIFTGATE (PLG) LATCH SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
  • Verify that the power liftgate (PLG) latch switch and power liftgate (PLG) control module connectors are disconnected.
  • Connect the negative battery terminal.

    (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)

  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the following terminals (wiring harness-side):
    • Power liftgate (PLG) latch switch terminal B
    • Power liftgate (PLG) latch switch terminal D
  • Is the voltage 0 V?
 Yes Go to the next step.
No Refer to appropriate wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Power liftgate (PLG) latch switch terminal B-Power liftgate (PLG) control module terminal 1Q
  • Power liftgate (PLG) latch switch terminal D-Power liftgate (PLG) control module terminal 1O

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 a short to power supply.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 8.
6 INSPECT POWER LIFTGATE (PLG) LATCH SWITCH CIRCUIT FOR OPEN CIRCUIT
  • Switch the ignition off.
  • Disconnect the negative battery terminal.

    (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)

  • Verify that the power liftgate (PLG) latch switch and power liftgate (PLG) control module connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Power liftgate (PLG) latch switch terminal B-Power liftgate (PLG) control module terminal 1Q
    • Power liftgate (PLG) latch switch terminal D-Power liftgate (PLG) control module terminal 1O
  • Is there continuity?
 Yes Go to the next step.
No Refer to appropriate wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Power liftgate (PLG) latch switch terminal B-Power liftgate (PLG) control module terminal 1Q
  • Power liftgate (PLG) latch switch terminal D-Power liftgate (PLG) control module terminal 1O

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 8.
7 INSPECT POWER LIFTGATE (PLG) LATCH SWITCH Yes Go to the next step.
No Replace the power liftgate (PLG) latch switch, then go to the next step.
(See LIFTGATE LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION .)
8 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
9 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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