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NO.4 ADVANCED KEYLESS START FUNCTION INOPERATIVE

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.