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.