No. 3 Transmitter Id Code Cannot Be Reprogrammed [Keyless Entry System]

3	Transmitter ID code cannot be reprogrammed
DESCRIPTION	Malfunction in keyless receiver or keyless control module circuit.
POSSIBLE CAUSE	Malfunction in keyless receiver related part Keyless receiver malfunction Keyless receiver power supply fuse malfunction Malfunction in wiring harness between keyless receiver and ground Malfunction in wiring harness between keyless receiver power supply fuses and keyless receiver Malfunction in wiring harness between keyless receiver and keyless control module Malfunction in keyless control module Malfunction in wiring harness between keyless receiver and keyless control module Keyless control module malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT POWER SUPPLY FUSE Is the keyless receiver power supply fuse normal?	Yes	Go to the next step.
1		No	Install an appropriate amperage fuse, then go to Step 6.
2	INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN FUSE BLOCK AND KEYLESS RECEIVER) OR ELSEWHERE Measure the voltage at the following keyless receiver terminal: Power supply signal (terminal 1A) Is the voltage B+?	Yes	Go to the next step.
2		No	Repair the wiring harness between the fuse block and keyless receiver, then go to step 6.
3	INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND GROUND) OR ELSEWHERE Is there continuity between keyless receiver connector terminal 1E and ground?	Yes	Go to the next step.
3		No	Repair the wiring harness between the keyless receiver and ground, then go to step 6.
4	INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND KEYLESS CONTROL MODULE) OR ELSEWHERE Disconnect the keyless receiver connector and keyless control module. is there continuity between the following terminals? Terminal 1A-terminal 3S Terminal 1C-terminal 3U	Yes	Go to the next step.
4		No	Repair the wiring harness between the keyless receiver and keyless control module, then go to step 6.
5	INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND KEYLESS CONTROL MODULE) OR KEYLESS CONTROL MODULE Measure the signal wave pattern for keyless receiver terminal 1C 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 keyless control module, then go to the next step. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION ).
5		No	Replace the keyless receiver, then go to the next step. (See KEYLESS RECEIVER REMOVAL/INSTALLATION ).
6	REINSPECT MALFUNCTION SYMPTOM AFTER REPAIR Does the keyless entry system operate properly?	Yes	Troubleshooting completed. Explain repairs to the customer.
6		No	Reinspect the malfunction symptoms, then repeat from step 1 if the malfunction recurs.