NO.4 ADVANCED KEYLESS START FUNCTION INOPERATIVE [ADVANCED KEYLESS ENTRY AND START SYSTEM]SM2446168
NO.4 ADVANCED KEYLESS START FUNCTION INOPERATIVE [ADVANCED KEYLESS ENTRY AND START SYSTEM]

id0903i1801500

4
Advanced keyless start function inoperative
POSSIBLE CAUSE
• Malfunction in the transmitter (advanced 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 M-MDS.
• 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
• Does the keyless indicator light (green) turn ON when pressing the start knob?
Yes
Go to Step 11.
No
If the keyless indicator light (green) does not illuminate:
• Go to the next step.
If the keyless warning light (red) is flushing:
• Go to Step 6.
If the keyless warning light (red) illuminates:
• Go to Step 9.
4
• Bring the transmitter (advanced key) inside the passenger compartment.
• Measure the voltage at the keyless control module terminal 3E (push switch) while pushing the start knob.
• Is the voltage B+?
• Does the keyless indicator light (green) turn ON when pressing the start knob?
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.
5
• Replace with a transmitter (advanced key) battery known to be good.
• Bring the transmitter (advanced key) inside the passenger compartment.
• Does the keyless entry system operate properly?
Yes
Replace the transmitter (advanced key). Then go to the next step.
No
Go to the next step.
6
• Measure the pulse profile using an oscilloscope at following keyless control module terminal (52-pin).
― Terminal 1A for exterior, RF keyless antenna
― Terminal 1C for exterior, LF keyless antenna
― Terminal 1E for exterior, rear keyless antenna
― Terminal 1I for interior, rear keyless antenna
― Terminal 1M for interior, middle keyless antenna
• Compare the pulse signal generating frequency between advanced key in communication areas and out of it.
• Is the pulse signal generating frequency at advanced key in communication areas become longer than out of it?
Note
• The pulse signal generating frequency at advanced key in communication are as twice as longer than out of it.
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 suspect 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.
7
• Measure the pulse profile using an oscilloscope at the keyless control module terminal 3C while operating the transmitter (advanced key).
• Is the pulse profile become long at moment of transmitter operation?
Yes
Go to the next step.
No
• Inspect the wiring harness between the keyless receiver and the keyless control module.
― If the harness is normal, replace the keyless receiver.
― If the harness is malfunctioning, repair the wiring harness.
• Go to the next step.
8
• Inspect the keyless receiver.
(See KEYLESS RECEIVER REMOVAL/INSTALLATION.)
• Is the keyless receiver normal?
Yes
Go to the next step.
No
Repair or replace malfunctioning part according to inspection result.
9
• Measure the keyless control module terminal 3H voltage.
• Is the voltage approx. 5.0 V?
Yes
Go to the next step.
No
• Inspect for open or short circuit between keyless control module terminal 3H (52-pin) and steering lock unit terminal K (12-pin).
― If the wiring harness is not normal, repair or replace for open or short circuit, then go to the next step.
― If the wiring harness is normal, go to the next step.
10
• Replace steering lock unit.
• Turn the start knob to START position.
• Does the advanced keyless start operate properly?
Yes
Troubleshooting completed.
Explain repairs to the customers.
No
Replace the keyless control module.
(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM].)
Then go to the next step.
11
• 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.