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.