NO.4 ADVANCED KEYLESS START FUNCTION INOPERATIVE

id0903c7801500

4 | Advanced keyless start function inoperative
POSSIBLE CAUSE | • Malfunction in the transmitter (card key). • Malfunction in the keyless control module. • Malfunction in the keyless receiver. • Malfunction in the keyless antenna. • Malfunction in the PCM.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Retrieve the advanced keyless system DTC using the WDS or equivalent. • Are there DTC displayed? | Yes | Perform the applicable DTC diagnostic procedures.
No | Go to the next step.
2 | • Attempt to start the engine using the key. • Does engine start? | Yes | Go to the next step.
No | Go to symptom troubleshooting flow No.3 in 01-03 section.
3 | • Bring the transmitter (card key) inside the passenger compartment. • Measure the voltage at the keyless control module terminal 2N (push switch) while pushing the start knob. • Is the voltage B+? | Yes | Go to the next step.
No | • Inspect the wiring harness between the steering lock unit and keyless control. ― If the harness is normal, replace the steering lock unit. ― If the harness is malfunctioning, repair the wiring harness. • Go to the next step.
4 | • Does the operation indicator light (LED) on the transmitter (card key) illuminate when any operation using the transmitter (card key) is performed? | Yes | Go to the next step.
No | Perform the procedure for symptom troubleshooting NO.1 [DOOR CANNOT BE LOCKED/UNLOCKED BY TRANSMITTER [ADVANCED KEYLESS AND START SYSTEM]. (See NO.1 DOOR CANNOT BE LOCKED/UNLOCKED BY TRANSMITTER (CARD KEY).)
5 | • Measure the voltage at the following keyless control module terminal while pressing the start knob. ― Terminal 1A and 1B for driver’s side keyless antenna ― Terminal 1C and 1D for passenger’s side keyless antenna ― Terminal 1E and 1F for exterior, rear keyless antenna ― Terminal 1G and 1H for interior, rear (4SD)/interior, RR (5HB, WGN) keyless antenna ― Terminal 1I and 1J for interior, RL keyless antenna (5HB, WGN) ― Terminal 1K and 1L for interior, middle keyless antenna ― Terminal 2G and 2H for interior, front keyless antenna • Is the voltage within 4.0—6.0 V? | Yes | Go to the next step.
No | • Inspect for open or short circuit between suspect keyless antenna and keyless control module. ― If the wiring harness normal, replace keyless antenna, then go to the next step. ― If the wiring harness is not normal, repair or replace for open or short circuit, then go to the next step.
6 | • Disconnect the keyless receiver connector and keyless control module connector. • Inspect the wiring harness between the following terminals for an open or short circuit. ― Terminal A — Terminal 2S ― Terminal C — Terminal 2U ― Terminal E — GND • Is the wiring harness normal? | Yes | Go to the next step.
No | Inspect and repair the wiring harness between the keyless control module and the keyless receiver, then go to the next step.
7 | • Measure the signal wave pattern for keyless control module terminal 2U when the start knob is pressed. • Does the signal wave pattern change when the start knob is pressed? Note • Perform the oscilloscope setting using 0.5 V/DIV (Y), 100 ms/DIV (X), DC range. | Yes | Go to the next step.
No | Replace the keyless receiver, and then go to next step.
8 | • Does the keyless indicator light turn ON when pressing the start knob? | Yes | Go to Step 10.
No | Go to the next step.
9 | • Measure the voltage at the keyless control module terminals 2P while pressing the start knob. ― 5.0 V→1.0 V or less • Is the voltage as above? | Yes | Go to the next step.
No | • Inspect the wiring harness between the steering lock unit and the keyless control module. ― If the harness is normal, replace the keyless control module. ― If the harness is malfunctioning, repair the wiring harness. • Go to the next step.
10 | • Does the keyless entry system operate properly? | Yes | Troubleshooting completed. Explain repairs to the customers.
No | Re-inspect the malfunction symptoms, then repeat form Step 1 if malfunction recurs.