NO.2 ALL ON-BOARD DIAGNOSTIC 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 on-board diagnostic functions inoperative
DESCRIPTION | • Malfunction in keyless control module power supply circuit, door switch circuit, trunk lid compartment light circuit, keyless control module ground circuit, or keyless receiver.
POSSIBLE CAUSE | • Malfunction in IG1 or B+ signal circuit of keyless control module ― Keyless control module power supply fuse malfunction ― Malfunction in wiring harness between keyless control module power supply fuses and keyless control module • Malfunction in door open/closed signal circuit of keyless control module ― Door switch system malfunction ― Keyless control module malfunction ― Malfunction in wiring harness between keyless control module and door switch • Malfunction in trunk lid open signal circuit of keyless control module ― Trunk lid compartment light switch system malfunction ― Keyless control module malfunction ― Malfunction in wiring harness between keyless control module and trunk lid compartment light switch • Malfunction in keyless control module GND signal circuit ― Malfunction in wiring harness between keyless control module and ground • Malfunction in keyless receiver ― Keyless receiver malfunction ― Malfunction in wiring harness between keyless control module and keyless receiver

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT KEYLESS CONTROL MODULE POWER SUPPLY FUSES • Are the keyless control module 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 CONTROL MODULE) OR ELSEWHERE • Turn the ignition switch to the ON position. • Measure the voltage at the following keyless control module terminals: ― IG1 signal (terminal 3B) ― B+ signal (terminal 1F) • Is the voltage B+? | Yes | Go to the next step.
No | Repair the wiring harness between the fuse block and keyless control module, then go to Step 12.
*4 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN FUSE BLOCK AND KEYLESS CONTROL MODULE, OR BETWEEN KEYLESS CONTROL MODULE AND GROUND) OR ELSEWHERE • Turn the ignition switch to the LOCK position. • Disconnect the keyless control module connector. • Measure the voltage at the following keyless control module connector terminal: ― IG1 signal (terminal 3B) • 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 CONTROL MODULE AND GROUND) OR ELSEWHERE • Is there continuity between keyless control module connector terminal 3C and ground? | Yes | Go to the next step.
No | Repair the wiring harness between the keyless control module and ground, then go to Step 12.
6 | INSPECT FOR CHECK CODE 04 IN INSTRUMENT CLUSTER • Inspect the door switch using the instrument cluster input/output check mode. (See 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 12.
7 | INSPECT KEYLESS CONTROL MODULE OR WIRING HARNESS (BETWEEN KEYLESS CONTROL MODULE AND DOOR SWITCHES, TRUNK LID COMPARTMENT LIGHT SWITCH FOR CONTINUITY) • Open the driver-side door. • Is there continuity between keyless control module connector terminal 4Q, 4T, 3Z and ground? | Yes | Replace the keyless control module and reprogram the keyless control module ID code, then go to the next step.
No | Repair the wiring harness between the keyless control module, door switches, and trunk lid compartment light switch, then go to the next step.
8 | 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: ― 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 12.
9 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND GROUND) OR ELSEWHERE • Is there continuity between keyless receiver connector 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 12.
10 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND KEYLESS CONTROL MODULE) OR ELSEWHERE • Turn the ignition switch to the ON position. • Disconnect the keyless receiver connector and keyless control module. • Is there continuity between the following terminals? ― Terminal A—terminal 3S ― Terminal C—terminal 3U | Yes | Go to the next step.
No | Repair the wiring harness between the keyless receiver and keyless control module, then go to Step 12.
11 | INSPECT IF MALFUNCTION IS IN KEYLESS RECEIVER OR KEYLESS CONTROL MODULE • Measure the signal wave pattern of keyless control module terminal 3U using an oscilloscope while the transmitter is operated with the auxiliary key removed from the ignition key cylinder. • Does the wave pattern change when the transmitter is operated? Note • Perform the oscilloscope setting using 0.5 V/DIV (Y), 100 ms/DIV (X), DC range. | Yes | Replace the keyless control module, then go to the next step. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION.)
No | Replace the keyless receiver, then go to the next step. (See KEYLESS RECEIVER REMOVAL/INSTALLATION.)
12 | 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.