NO.2 ALL ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE [KEYLESS ENTRY SYSTEM]
id0903d2800700
|
2
|
All on-board diagnostic 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
• Malfunction in door open/closed signal circuit of BCM
• Malfunction in BCM GND signal circuit
• Malfunction in keyless receiver
|
![]() |
|
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 LATCH SWITCH INSTALLATION
• Are the door latch switches installed securely?
|
Yes
|
Go to the next step.
|
|
No
|
Install the door latch 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:
• 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 16.
|
||
|
*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 LOCK position.
• Disconnect the BCM connector.
• Measure the voltage at the following BCM terminal (wiring harness-side):
• Is the voltage B+?
|
Yes
|
Repair the malfunctioning wiring harness, then go to Step 16.
|
|
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 3S/4G and ground?
|
Yes
|
Go to the next step.
|
|
No
|
Repair the wiring harness between the BCM and ground, then go to Step 16.
|
||
|
6
|
VERIFY IF MALFUNCTION CAUSE IS ERRATIC DOOR SWITCH SIGNAL
• Measure the voltage at following BCM terminals.
― Terminal 5AB (Front door switch (Driver-side))
― Terminal 5V (Front door switch (Passenger-side))
― Terminal 5Y (Rear door switch (LH))
― Terminal 5Z (Rear door switch (RH))
― Terminal 5T (Liftgate latch switch)
• Is the terminal voltage normal?
|
Yes
|
Go to Step 11.
|
|
No
|
If terminal 5AB, 5V, 5Y, 5Z is not specified:
• Go to the next step.
If terminal 5T is not specified:
• Go to step 9.
|
||
|
7
|
INSPECT DOOR SWITCH
• Inspect switches for all doors.
(See DOOR SWITCH INSPECTION.)
• Are there operations normal?
|
Yes
|
Go to the next step.
|
|
No
|
Replace suspect door switch.
|
||
|
8
|
INSPECT BCM OR WIRING HARNESS (BETWEEN BCM AND DOOR LATCH SWITCHES FOR CONTINUITY)
• Open all doors.
• Is there continuity between BCM terminals 5V, 5Y, 5Z, 5AB and ground?
|
Yes
|
Repair the wiring harness between the BCM and door switches, then go to the next step.
|
|
No
|
Replace the BCM and reprogram the transmitter ID code, then go to the next step.
|
||
|
9
|
INSPECT LIFTGATE LATCH SWITCH
• Inspect the liftgate latch switch.
• Is the liftgate latch switch normal?
|
Yes
|
Go to the next step.
|
|
No
|
Replace liftgate latch switch.
|
||
|
10
|
INSPECT BCM OR WIRING HARNESS (BETWEEN BCM AND LIFTGATE LATCH SWITCH FOR OPEN OR SHORT)
• Inspect for open or short circuit between BCM and liftgate latch switch.
• Is the wiring harness and connectors normal?
|
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 liftgate latch switch, then go to the next step.
|
||
|
11
|
INSPECT POWER SUPPLY FUSE
• Is the keyless receiver power supply fuse normal?
|
Yes
|
Go to the next step.
|
|
No
|
Install an appropriate amperage fuse.
|
||
|
12
|
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:
• 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 16.
|
||
|
13
|
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 16.
|
||
|
14
|
INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY OR SHORT CIRCUIT BETWEEN THE KEYLESS RECEIVER AND THE BCM) OR ELSEWHERE
• Turn the ignition switch to LOCK position.
• Disconnect the keyless receiver (6-pin) and the BCM (24-pin) connector.
• Inspect wiring harness and connectors for continuity between keyless receiver terminal D (6-pin) and BCM terminal 3E (24-pin).
• Is the wiring harness and connectors normal?
|
Yes
|
Go to the next step.
|
|
No
|
Repair or replace suspect part, then go to Step 16.
|
||
|
15
|
INSPECT IF MALFUNCTION IS IN KEYLESS RECEIVER OR BCM
• Measure the signal wave pattern for BCM terminal 3E 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?
|
Yes
|
Replace the BCM, then go to the next step.
|
|
No
|
Replace the keyless receiver, then go to the next step.
|
||
|
16
|
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.
|
||