DTC B1451:02 [POWER LIFTGATE (PLG) CONTROL MODULE]

id0902o8048600

Description	Return switch circuit malfunction
Detection condition	• The voltage input to the return switch does not change while the power liftgate (PLG) system is operating.
Fail-safe	• Stops the power liftgate (PLG) system operation.
Possible cause	• Power liftgate (PLG) latch switch connector or terminal malfunction • Open circuit in wiring harness between power liftgate (PLG) latch switch terminal C and body ground • Power liftgate (PLG) control module connector or terminal malfunction • Short to ground in wiring harness between power liftgate (PLG) latch switch terminal E and power liftgate (PLG) control module terminal 1T • Short to power supply in wiring harness between power liftgate (PLG) latch switch terminal E and power liftgate (PLG) control module terminal 1T • Open circuit in wiring harness between power liftgate (PLG) latch switch terminal E and power liftgate (PLG) control module terminal 1T • Power liftgate (PLG) latch switch malfunction • Power liftgate (PLG) control module malfunction

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.
1		No	Repair or replace the connector, then go to Step 8.
2	INSPECT RETURN 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.
2		No	Refer to the 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.
3		No	Repair or replace the connector, then go to Step 8.
4	INSPECT RETURN 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 power liftgate (PLG) latch switch terminal E (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between power liftgate (PLG) latch switch terminal E and power liftgate (PLG) control module terminal 1T. 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.
4		No	Go to the next step.
5	INSPECT RETURN 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 power liftgate (PLG) latch switch terminal E (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between power liftgate (PLG) latch switch terminal E and power liftgate (PLG) control module terminal 1T. 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 RETURN 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 power liftgate (PLG) latch switch terminal E (wiring harness-side) and power liftgate (PLG) control module terminal 1T (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between power liftgate (PLG) latch switch terminal E and power liftgate (PLG) control module terminal 1T. 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 • Inspect the power liftgate (PLG) latch switch. (See LIFTGATE/POWER LIFTGATE (PLG) LATCH SWITCH INSPECTION.) • Is the power liftgate (PLG) latch switch?	Yes	Go to the next step.
7		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 • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the power liftgate (PLG) control module using the M-MDS. (See CLEARING DTC [POWER LIFTGATE (PLG) CONTROL MODULE].) • Retrieve the power liftgate (PLG) control module DTCs using the M-MDS. (See DTC INSPECTION [POWER LIFTGATE (PLG) CONTROL MODULE].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the power liftgate (PLG) control module. (See POWER LIFTGATE (PLG) CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
8		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].)
9		No	DTC troubleshooting completed.