NO.2 ALL KEYLESS ENTRY SYSTEM FUNCTIONS INOPERATIVE [KEYLESS ENTRY SYSTEM]

id0903d2898600

• When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that the connectors, terminals and wiring harnesses are connected correctly and undamaged.

2 | All keyless entry system functions inoperative
DESCRIPTION | • Malfunction in BCM power supply circuit, door latch switch circuit, BCM ground circuit, or keyless receiver.
POSSIBLE CAUSE | • Malfunction in IG1 or power supply signal circuit of BCM ― BCM power supply fuse malfunction ― Malfunction in wiring harness between BCM power supply fuses and BCM • Malfunction in door open/closed signal circuit of BCM ― Door switch system malfunction ― BCM malfunction ― Malfunction in wiring harness between BCM and door latch switch • Malfunction in BCM GND signal circuit ― Malfunction in wiring harness between BCM and ground • Malfunction in keyless receiver ― Keyless receiver malfunction ― Malfunction in wiring harness between keyless receiver and BCM

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT BCM POWER SUPPLY FUSES • Are the BCM power supply fuses normal? | Yes | Go to the next step.
No | Install an appropriate amperage fuse.
2 | INSPECT DOOR SWITCH INSTALLATION • Are the door switches installed securely? | Yes | Go to the next step.
No | Install the door switches securely, then go back to Step 5 of KEYLESS ENTRY SYSTEM PRELIMINARY INSPECTION.
*3 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN FUSE BLOCK AND BCM) OR ELSEWHERE • Turn the ignition switch to the ON position. • Measure the voltage at the following BCM terminals: ― IG1 signal (terminal 4A, 4D) ― Power supply signal (terminal 2A, 2B, 4F) • Is the voltage B+? | Yes | Go to the next step.
No | Repair the wiring harness between the fuse block and BCM, then go to Step 13.
*4 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (SHORT TO POWER SUPPLY BETWEEN FUSE BLOCK AND BCM, OR BETWEEN BCM AND GROUND) OR ELSEWHERE • Turn the ignition switch to the OFF position. • Disconnect the BCM connector. • Measure the voltage at the following BCM terminal (wiring harness-side): ― IG1 signal (terminal 4A, 4D) • Is the voltage B+? | Yes | Repair the malfunctioning wiring harness, then go to Step 13.
No | Go to the next step.
*5 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN BCM AND GROUND) OR ELSEWHERE • Is there continuity between BCM terminal 2N, 2G and ground? | Yes | Go to the next step.
No | Repair the wiring harness between the BCM and ground, then go to Step 13.
6 | INSPECT OF MALFUNCTION IS IN DOOR SWITCH, WIRING HARNESS OR ELSEWHERE • Connect the M-MDS to DLC-2. • Turn the ignition switch to ON position. • Monitor the following door switch related PID. • Do these PIDs displayed properly? | Yes | Go to the next step.
No | Inspect and repair or replace suspected door switch and related wiring harness. Then go to Step 13.
7 | INSPECT BCM OR WIRING HARNESS (BETWEEN BCM AND DOOR LATCH SWITCHES FOR CONTINUITY) • Open all doors. • Is there continuity between BCM terminals 6O, 6M, 6R, 6Q and ground? | Yes | Replace the BCM and reprogram the transmitter ID code, then go to the next step.
No | Repair the wiring harness between the BCM and door latch switches, then go to the next step.
8 | INSPECT POWER SUPPLY FUSE • Is the keyless receiver power supply fuse normal? | Yes | Go to the next step.
No | Install an appropriate amperage fuse.
9 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN FUSE BLOCK AND KEYLESS RECEIVER) OR ELSEWHERE • Turn the ignition switch to the ON position. • Measure the voltage at the following keyless receiver terminal: ― B+ 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 13.
10 | 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 13.
11 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND BCM) OR ELSEWHERE • Turn the ignition switch to the ON position. • 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 13.
12 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND BCM) 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.)
13 | 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.