Diagnostic Procedure

DIAGNOSTIC PROCEDURE DESCRIPTION

Step	Inspection		Action
1	Inspect the keyless receiver. Is the keyless receiver power supply voltage normal? Power supply (+B) (terminal A)	Yes	Go to the next step.
1		No	Inspect for a burnt fuse (ROOM 15 A) Inspect the power supply system wiring harness for an open or short circuit. Go to Step 5.
2	Inspect the keyless receiver. Is the keyless receiver grounded normally? 0 V (terminal E)	Yes	Go to the next step.
2		No	Inspect the ground system wiring harness for an open circuit.
3	Switch the ignition to off. Disconnect the negative battery cable. Disconnect the keyless receiver connector (6-pin) and the BCM connector (24-pin). Inspect the wiring harness between the following terminals for an open or short circuit. Terminal D to 6W Is it normal?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness between the keyless receiver connector and the BCM connector, then go to the next step.
4	Replace the keyless receiver or BCM. Measure the signal wave pattern for keyless receiver terminal D (6-pin) using an oscilloscope when the transmitter is operated with the key not inserted into the ignition key cylinder. Does the wave pattern change when the transmitter is operated? NOTE: Perform the oscilloscope setting using 0.5V/DIV (Y), 100ms/DIV (X), DC range.	Yes	Replace the BCM, then go to the next step. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION ).
4		No	Replace the keyless receiver, then go to the next step. (See KEYLESS RECEIVER REMOVAL/INSTALLATION [KEYLESS ENTRY SYSTEM] ).
5	Does the keyless entry system operate properly?	Yes	Troubleshooting completed. Explain repairs to the customer.
5	Does the keyless entry system operate properly?	No	Reinspect the malfunction symptoms, then repeat from Step 1 if the malfunction recurs.