NO.2 ALL ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE


BHE090369000W05

• 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.

• The door switches include the rear door upper latch switches and rear door lower latch switches.

2

All on-board diagnostic functions inoperative

DESCRIPTION

• Malfunction in keyless unit power supply circuit, door switch circuit, trunk lid compartment light circuit, keyless unit ground circuit, or keyless receiver.

POSSIBLE CAUSE

• Malfunction in IG1 or B+ signal circuit of keyless unit
– Keyless unit power supply fuse malfunction
– Malfunction in wiring harness between keyless unit power supply fuses and keyless unit
• Malfunction in door open/closed signal circuit of keyless unit
– Door switch system malfunction
– Keyless unit malfunction
– Malfunction in wiring harness between keyless unit and door switch
• Malfunction in trunk lid open signal circuit of keyless unit
– Trunk lid compartment light switch system malfunction
– Keyless unit malfunction
– Malfunction in wiring harness between keyless unit and trunk lid compartment light switch
• Malfunction in keyless unit GND signal circuit
– Malfunction in wiring harness between keyless unit and ground
• Malfunction in keyless receiver
– Keyless receiver malfunction
– Malfunction in wiring harness between keyless unit and keyless receiver

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT KEYLESS UNIT POWER SUPPLY FUSES

• Are the keyless unit power supply fuses normal?
Yes
Go to the next step.
No
Inspect for a short to ground in circuit of blown fuse. Repair or replace if necessary.
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 KEYLESS UNIT) OR ELSEWHERE

• Turn the ignition switch to the ON position.
• Measure the voltage at the following keyless unit terminals:
– IG1 signal (terminal 2B)
– B+ signal (terminal 2A)
• Is the voltage B+?
Yes
Go to the next step.
No
Repair the wiring harness between the fuse block and keyless unit, then go to Step 13.
*4

INSPECT IF MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN FUSE BLOCK AND KEYLESS UNIT, OR BETWEEN KEYLESS UNIT AND GROUND) OR ELSEWHERE

• Turn the ignition switch to the LOCK position.
• Disconnect the keyless unit connector.
• Measure the voltage at the following keyless unit connector terminal:
– IG1 signal (terminal 2B)
• 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 KEYLESS UNIT AND GROUND) OR ELSEWHERE

• Is there continuity between keyless unit connector terminal 2W and ground?
Yes
Go to the next step.
No
Repair the wiring harness between the keyless unit and ground, then go to Step 13.
6

INSPECT FOR CHECK CODE 04 IN INSTRUMENT CLUSTER

• Inspect the door switch using the instrument cluster input/output check mode.
• Is DTC 04 displayed?
Yes
Go to the next step.
No
Repair the door switch system using the DTC 04 inspection procedure, then go to Step 13.
7

INSPECT KEYLESS UNIT OR WIRING HARNESS (BETWEEN KEYLESS UNIT AND DOOR SWITCHES, TRUNK LID COMPARTMENT LIGHT SWITCH FOR CONTINUITY)

• Open the driver-side door.
• Is there continuity between keyless unit connector terminal 2K, 2G and ground?
Yes
Replace the keyless unit and reprogram the keyless unit ID code, then go to the next step.
No
Repair the wiring harness between the keyless unit, door switches, and trunk lid compartment light switch, 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
Inspect for a short to ground in circuit of blown fuse. Repair or replace if necessary.
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:
– IG1 signal (terminal 1A)
• 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 connector terminal 1E 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 KEYLESS UNIT) OR ELSEWHERE

• Turn the ignition switch to the ON position.
• Disconnect the keyless receiver connector and keyless unit.
• Is there continuity between the following terminals?
– Terminal 1B-terminal 2N
– Terminal 1C-terminal 2P
Yes
Go to the next step.
No
Repair the wiring harness between the keyless receiver and keyless unit, then go to Step 13.
12

INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND KEYLESS UNIT) OR KEYLESS UNIT

• Measure the voltage at keyless unit terminal 2N.
– When transmitter operated:
• Any transmitter button is operated without key in steering lock (key reminder switch off): 5 V1.0 V or less
• Key is in steering lock (key reminder switch on):5 V
• Is the voltage normal?
Yes
Replace the keyless unit, then go to the next step.
No
Replace the keyless receiver, then go to the next step.
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.