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

id0903d2800800

3 | Transmitter ID code cannot be reprogrammed
DESCRIPTION | • Malfunction in keyless control module circuit, or keyless receiver circuit.
POSSIBLE CAUSE | • Malfunction in keyless receiver related part ― Keyless receiver malfunction ― Malfunction in wiring harness between keyless receiver and ground ― Malfunction in wiring harness between keyless receiver and keyless control module • Malfunction in keyless control module ― Keyless control module power supply fuse malfunction ― 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 control module 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 connector 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 KEYLESS CONTROL MODULE) OR ELSEWHERE • Disconnect the keyless receiver connector and keyless control module. • Is there continuity between the following terminals? ― Terminal A—terminal 3S ― Terminal C—terminal 3U | Yes | Go to the next step.
No | Repair the wiring harness between the keyless receiver and keyless control module, then go to Step 6.
5 | INSPECT IF MALFUNCTION IS IN KEYLESS RECEIVER OR KEYLESS CONTROL MODULE • Measure the signal wave pattern of keyless control module terminal 3U using an oscilloscope while the transmitter is operated with the auxiliary key removed from the ignition key cylinder. • Does the wave pattern change when the transmitter is operated? Note • Perform the oscilloscope setting using 0.5 V/DIV (Y), 100 ms/DIV (X), DC range. | Yes | Replace the keyless control module, then go to the next step. (See KEYLESS CONTROL MODULE 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.