NO.3 TRANSMITTER ID CODE CANNOT BE REPROGRAMMED [KEYLESS ENTRY SYSTEM]

id0903d2800800

3 | Transmitter ID code cannot be reprogrammed
DESCRIPTION | • Malfunction in BCM circuit or keyless receiver circuit.
POSSIBLE CAUSE | • Keyless receiver malfunction ― 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 BCM or keyless control module • BCM malfunction ― Malfunction in wiring harness between keyless receiver and BCM ― Malfunction in BCM

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT POWER SUPPLY FUSE • Is the keyless receiver power supply fuse normal? | Yes | Go to the next step.
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 A) • Is the voltage B+? | Yes | Go to the next step.
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 terminal E and ground? | Yes | Go to the next step.
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 BCM) OR ELSEWHERE • Disconnect the keyless receiver connector and BCM connector. • Is there continuity between the following terminals? ― 3B (BCM connector)—D (keyless receiver connector) | Yes | Go to the next step.
No | Repair the wiring harness between the keyless receiver and BCM, then go to Step 6.
5 | INSPECT IF MALFUNCTION IS IN KEYLESS RECEIVER OR BCM • Measure the signal wave pattern for BCM terminal 3B 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.)
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.
No | Reinspect the malfunction symptoms, then repeat from Step 1 if the malfunction recurs.