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

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•  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 latch switch system malfunction
―  BCM malfunction
―  Malfunction in wiring harness between BCM and door latch switch
•  Malfunction in trunk lid/liftgate latch switch signal circuit
―  Open or short circuit in wiring between BCM and trunk lid/liftgate lid latch switch
―  Trunk lid/liftgate latch switch malfunction
•  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
CONFIRM BCM DTC
•  Perform the BCM DTC inspection using the M-MDS.
•  Are the following DTCs present?
―  B11C0:13
―  B11C1:13
―  B1175:13
―  B1176:13
―  B1178:11
Yes
Conduct a check according to the DTC.
(See DTC TABLE [BCM].)
No
Go to the next step.
2
INSPECT POWER SUPPLY FUSE
•  Is the keyless receiver power supply fuse normal?
Yes
Go to the next step.
No
Inspect and repair short to GND in wiring harness at keyless receiver power supply circuit install an appropriate amperage fuse, then go to step 7.
3
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:
―  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 7.
4
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 7.
5
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?
―  4K (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 7.
6
INSPECT IF MALFUNCTION IS IN KEYLESS RECEIVER OR BCM
•  Measure the signal wave pattern for BCM terminal 4K 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 [L.H.D.].)
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION [R.H.D.].)
No
Replace the keyless receiver, then go to the next step.
(See KEYLESS RECEIVER REMOVAL/INSTALLATION.)
7
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.