No. 1 Keyless Entry System Does Not Operate Normally [Keyless Entry System]

When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that the connectors, terminals and wiring harnesses are connected correctly and undamaged.

1	Keyless entry system does not operate normally
DESCRIPTION	Malfunction in door lock linkage system, or BCM
POSSIBLE CAUSE	Malfunction in BCM power supply Open circuit in IG1 and/or B+ power supply circuit Open or short circuit in ground circuit BCM malfunction Malfunction in key reminder switch related circuit key reminder switch malfunction Malfunction in door latch switch signal circuit Open or short circuit in wiring between BCM and door latch switch Door latch switch malfunction Malfunction in door lock/unlock signal circuit Door lock actuator malfunction Open or short circuit in wiring between BCM and door lock actuator Malfunction in turn light signal circuit BCM malfunction Open or short circuit wiring between BCM and each turn signal light

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT FOR MALFUNCTION IN BCM POWER SUPPLY CIRCUIT OR ELSEWHERE Did any of the following items operate during the keyless entry system operation inspection? All doors lock/unlock Hazard warning light flashes	Yes	Go to the next step.
1		No	Inspect the connection of the BCM connectors, and go to Step 4.
2	INSPECT FOR MALFUNCTION IN KEY REMINDER SWITCH OR ELSEWHERE Did the following item operate during the keyless entry system operation inspection? All doors lock/unlock	Yes	Go to the next step.
2		No	Go to Step 8.
3	INSPECT FOR MALFUNCTION IN DOOR LOCK ACTUATOR OR ELSEWHERE Did the following item operate during the keyless entry system operation inspection? Hazard warning light flashes	Yes	Go to the next step.
3		No	Go to Step 10.
*4	INSPECT BCM POWER SUPPLY CIRCUIT Are the BCM power supply and voltage normal? IG1 signal (terminal 4T) B+ signal (terminal 3J, 5B, 4S)	Yes	Go to the next step.
*4		No	Inspect for burnt fuse. Inspect the power supply system wiring harness for an open or short circuit. Then go to Step 13.
*5	INSPECT BCM GROUND CIRCUIT Is the BCM ground voltage normal? 1.0 V or less (terminal 2N, 4B)	Yes	Go to the next step.
*5		No	Inspect the ground system wiring harness for open circuit. Then go to Step 13.
*6	INSPECT DOOR LATCH SWITCH SIGNAL Monitor following BCM (door latch switch) PID using the M-MDS. TR/LG_SW (Trunk lid/liftgate latch switch) DRSW_P (Passenger's door latch switch) DRSW_D (Driver's door latch switch) DRSW_LR (Left Rear door latch switch) DRSW_RR (Right Rear door latch switch) Are monitored PID values normal?	Yes	Go to the next step.
*6		No	Inspect for open or short circuit in wiring harness between BCM and suspected door latch/trunk lid/liftgate latch switch. If wiring harness is normal, inspect suspect door latch/trunk lid/liftgate latch switch. (See FRONT DOOR LATCH SWITCH INSPECTION ). (See REAR DOOR LATCH SWITCH INSPECTION ). (See TRUNK LID LATCH SWITCH INSPECTION ). (See LIFTGATE LATCH SWITCH INSPECTION ). If wiring harness malfunction, repair or replace wiring harness, then go to Step 13.
7	INSPECT KEY REMINDER SWITCH Measure the voltage at the following BCM terminals: Key reminder switch signal (terminal 2J) ON (Key inserted ignition key cylinder): B+ OFF (Key removed ignition key cylinder): 1.0 V or less Is the key reminder switch normal?	Yes	Replace the BCM.
7		No	Replace the key reminder switch, then go to Step 13.
*8	INSPECT IF MALFUNCTION IS IN DOOR LOCK ACTUATOR, BCM GROUND CIRCUIT OR ELSEWHERE Measure the voltage at the BCM terminals 50, 5M while operating the transmitter. All door locked: 1.0 V or less → B+ → 1.0 V or less (Normal lock: 5O terminal) Driver-side door unlocked: 1.0 V or less → B+ → 1.0 V or less (Normal lock: 5M terminal) All doors unlocked: 1.0 V or less A®B+A® 1.0 V or less (2 stage unlock: 5K terminal) Is the voltage as above?	Yes	Go to the next step.
*8		No	Inspect the wiring harness between BCM and the door lock actuator for an open or short circuit. Inspect the door lock actuator. Then go to Step 13.
9	INSPECT DOOR LOCK LINKAGE Operate the key cylinder and verify the door locks and unlock manually. Does every door lock system work?	Yes	Go to step 11.
9		No	Inspect the door lock linkage then go to Step 1.
*10	INSPECT FOR MALFUNCTION IN THEFT-DETERRENT SYSTEM OR ELSEWHERE Is the theft-deterrent system equipped?	Yes	Go to the next step.
*10		No	Go to step 12.
11	INSPECT HOOD LATCH SWITCH AND TRUNK/LIFTGATE SIGNAL Monitor following BCM PID using the M-MDS. TR/LG_SW (trunk lid/liftgate latch switch) HOOD_SW (hood latch switch) Are monitored PID values ON (open)?	Yes	Normal operation (Hazard warning light flashing on vehicles with theft-deterrent system operates in conjunction with theft-deterrent system).
11		No	Go to the next step.
*12	INSPECT TURN LIGHT SIGNAL CIRCUIT Measure voltage at the BCM terminals 5C, 3L (right side turn signal), 5E, 3K (left side turn signal) while operating hazard and/or turn signal on. Are the terminal voltages are alternated between 1.0V or less and B+?	Yes	Verify the malfunction symptom again.
*12		No	Inspect the wiring harnesses between the BCM and each turn light for a short circuit. Inspect each turn light. If these items are normal, replace the BCM.
*13	REINSPECT MALFUNCTION SYMPTOM AFTER REPAIR Does the keyless entry system operate properly?	Yes	Troubleshooting completed. Explain repairs to the customer.
*13		No	Reinspect the malfunction symptoms, then repeat from Step 1 if the malfunction recurs.