Inspection Procedure 2

Inspection Procedure 2: The keyless operation key cannot be registered using scan tool.














TECHNICAL DESCRIPTION (COMMENT)

If only some keyless operation keys cannot be registered, the keyless operation key itself may be faulty. If no keyless operation key can be registered, the key assembly may have already been registered for another vehicle, or the KOS-ECU may be faulty.

TROUBLESHOOTING HINTS

- Malfunction of the keyless operation key
- Damaged wiring harness and connectors
- Malfunction of KOS-ECU
- Ignition key registered for other vehicle

DIAGNOSIS

Required Special Tools:

- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Check the keyless operation key inserted in the key cylinder for interference.

Q. Are there other keyless operation keys or anything that interferes with the communication (things that generate radio waves such as magnets and an air-cleaning device that has a power plug) near the keyless operation key inserted in the key cylinder?

YES Move away or remove other keyless operation keys or things that interfere with the communication (things that generate radio waves such as magnets and a air-cleaning device that has a power plug) near the keyless operation key. Then, go to step 2.
NO Go to Step 3.
STEP 2. Retest the system

Check that the keyless operation key can be registered.

Q. Is the keyless operation key that cannot be registered using scan tool?

YES Go to Step 3.
NO The procedure is complete.
STEP 3. Check which keyless operation key cannot be registered.

Q. Can any one of the keyless operation keys be registered?

YES (Only some keys) : Replace the key that cannot be registered and register the ID codes (Refer to ID Codes Registration Procedure).
After registering the ID codes, go to Step 5.
NO (All keys) : Go to Step 4.
STEP 4. Retest the system

Check the scan tool screen when the key was not able to be registered.

Q. Is the error message of scan tool screen "Abnormality in key" ?

YES (Abnormality in key) : Carry out DTC B1A25: Key ID unmatched and DTC B1A35: Transponder read error (Refer to Keyless Operation System (KOS) [B1A25], Keyless Operation System (KOS) [B1A35]).
Then, go to Step 6.
NO (ECU internal error) : Replace KOS-ECU and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table).
STEP 5. Retest the system

Check that the keyless operation key can be registered.

Q. Is the keyless operation key that cannot be registered using scan tool?

YES Replace KOS-ECU and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table).
NO The procedure is complete.
STEP 6. Retest the system

Check that the keyless operation key can be registered.

Q. Is the keyless operation key that cannot be registered using scan tool?

YES Go to Step 7.
NO The procedure is complete.
STEP 7. Check receiver antenna module connector C-08, receiver antenna assembly connector D-14, KOS-ECU connector C-05 and intermittent connector C-41 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the receiver antenna module connector C-08, receiver antenna assembly connector D-14, KOS-ECU connector C-05 and intermittent connector C-41 in good condition?

YES Go to Step 8.
NO Repair the defective connector.
STEP 8. Check the wiring harness between the receiver antenna assembly connector D-14 (terminal Nos.1, 8, 12, 3, 5) and the KOS-ECU connector C-05 (terminal Nos.12, 32, 7, 9, 13) for open circuit.

(1)Disconnect receiver antenna assembly connector D-14 and KOS-ECU connector C-05, and check the wiring harness.





(2)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.1) and KOS-ECU connector C-05 (terminal No.12)
OK: Continuity exists (2ohms or less)






(3)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.8) and KOS-ECU connector C-05 (terminal No.32)
OK: Continuity exists (2ohms or less)






(4)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and KOS-ECU connector C-05 (terminal No.7)
OK: Continuity exists (2ohms or less)






(5)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.3) and KOS-ECU connector C-05 (terminal No.9)
OK: Continuity exists (2ohms or less)






(6)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.5) and KOS-ECU connector C-05 (terminal No.13)
OK: Continuity exists (2ohms or less)

Q. Is the wiring harness between receiver antenna assembly connector D-14 (terminal Nos.1, 8, 12, 3, 5) and the KOS-ECU connector C-05 (terminal Nos.12, 32, 7, 9, 13) in good condition?

YES : Go to Step 9.

NO (receiver antenna assembly connector D-14 terminal No.1 - KOS-ECU connector C-05 terminal No.12.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.1) and the KOS-ECU connector C-05 (terminal No.12).

NO (receiver antenna assembly connector D-14 terminal No.8 - KOS-ECU connector C-05 terminal No.32.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.8) and the KOS-ECU connector C-05 (terminal No.32).

NO (receiver antenna assembly connector D-14 terminal No.12 - KOS-ECU connector C-05 terminal No.7.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and the KOS-ECU connector C-05 (terminal No.7).

NO (receiver antenna assembly connector D-14 terminal No.3 - KOS-ECU connector C-05 terminal No.9.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.3) and the KOS-ECU connector C-05 (terminal No.9).

NO (receiver antenna assembly connector D-14 terminal No.5 - KOS-ECU connector C-05 terminal No.13.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.5) and the KOS-ECU connector C-05 (terminal No.13).

STEP 9. Check the wiring harness between the receiver antenna assembly connector D-14 (terminal Nos.1, 8, 12, 3, 5) and the ground for short circuit.

(1)Disconnect receiver antenna assembly connector D-14, and check the wiring harness.





(2)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.1) and ground
OK: No continuity






(3)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.8) and ground
OK: No continuity






(4)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and ground
OK: No continuity






(5)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.3) and ground
OK: No continuity






(6)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.5) and ground
OK: No continuity

Q. Is the wiring harness between receiver antenna assembly connector D-14 (terminal Nos.1, 8, 12, 3, 5) and the ground in good condition?

YES : Go to Step 10.

NO (receiver antenna assembly connector D-14 terminal No.1 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.1) and the ground.

NO (receiver antenna assembly connector D-14 terminal No.8 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.8) and the ground.

NO (receiver antenna assembly connector D-14 terminal No.12 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and the ground.

NO (receiver antenna assembly connector D-14 terminal No.3 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.3) and the ground.

NO (receiver antenna assembly connector D-14 terminal No.5 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.5) and the ground.

STEP 10. Replace the receiver antenna assembly, and retest the system.

Check that the keyless operation key can be registered.

Q. Is the keyless operation key that cannot be registered using scan tool?

YES Go to Step 11.
NO The procedure is complete.
STEP 11. Check the wiring harness between the receiver antenna module connector C-08 (terminal Nos. 2, 1, 8, 12) and the KOS-ECU connector C-05 (terminal Nos. 11, 12, 32, 7) for open circuit.

(1)Disconnect receiver antenna module connector C-08 and KOS-ECU connector C-05, and check the wiring harness.





(2)Check the wiring harness between receiver antenna module connector C-08 (terminal No.2) and KOS-ECU connector C-05 (terminal No.11)
OK: Continuity exists (2ohms or less)






(3)Check the wiring harness between receiver antenna module connector C-08 (terminal No.1) and KOS-ECU connector C-05 (terminal No.12)
OK: Continuity exists (2ohms or less)






(4)Check the wiring harness between receiver antenna module connector C-08 (terminal No.8) and KOS-ECU connector C-05 (terminal No.32)
OK: Continuity exists (2ohms or less)






(5)Check the wiring harness between receiver antenna module connector C-08 (terminal No.12) and KOS-ECU connector C-05 (terminal No.7)
OK: Continuity exists (2ohms or less)

Q. Is the wiring harness between receiver antenna module connector C-08 (terminal Nos. 2, 1, 8, 12) and the KOS-ECU connector C-05 (terminal Nos. 11, 12, 32, 7) in good condition?

YES : Go to Step 12.

NO (receiver antenna module connector C-08 terminal No.2 - KOS-ECU connector C-05 terminal No.11.) : Repair the wiring harness between receiver antenna module connector C-08 (terminal No. 2) and the KOS-ECU connector C-05 (terminal No. 11).

NO (receiver antenna module connector C-08 terminal No.1 - KOS-ECU connector C-05 terminal No.12.) : Repair the wiring harness between receiver antenna module connector C-08 (terminal No. 1) and the KOS-ECU connector C-05 (terminal No. 12).

NO (receiver antenna module connector C-08 terminal No.8 - KOS-ECU connector C-05 terminal No.32.) : Repair the wiring harness between receiver antenna module connector C-08 (terminal No. 8) and the KOS-ECU connector C-05 (terminal No. 32).

NO (receiver antenna module connector C-08 terminal No.12 - KOS-ECU connector C-05 terminal No.7.) : Repair the wiring harness between receiver antenna module connector C-08 (terminal No. 12) and the KOS-ECU connector C-05 (terminal No. 7).

STEP 12. Check the wiring harness between the receiver antenna module connector C-08 (terminal Nos. 2, 1, 8, 12) and the ground for short circuit.

(1)Disconnect receiver antenna module connector C-08, and check the wiring harness.





(2)Check the wiring harness between receiver antenna module connector C-08 (terminal No.2) and ground.
OK: No continuity






(3)Check the wiring harness between receiver antenna module connector C-08 (terminal No.1) and ground.
OK: No continuity






(4)Check the wiring harness between receiver antenna module connector C-08 (terminal No.8) and ground.
OK: No continuity






(5)Check the wiring harness between receiver antenna module connector C-08 (terminal No.12) and ground.
OK: No continuity

Q. Is the wiring harness between receiver antenna module connector C-08 (terminal Nos. 2, 1, 8, 12) and the ground in good condition?

YES : Go to Step 13.

NO (receiver antenna module connector C-08 terminal No.2 - ground.) : Repair the wiring harness between receiver antenna module connector C-08 (terminal No. 2) and the ground.

NO (receiver antenna module connector C-08 terminal No.1 - ground.) : Repair the wiring harness between receiver antenna module connector C-08 (terminal No. 1) and the ground.

NO (receiver antenna module connector C-08 terminal No.8 - ground.) : Repair the wiring harness between receiver antenna module connector C-08 (terminal No. 8) and the ground.

NO (receiver antenna module connector C-08 terminal No.12 - ground.) : Repair the wiring harness between receiver antenna module connector C-08 (terminal No. 12) and the ground.

STEP 13. Replace the receiver antenna module, and retest the system.

Check that the keyless operation key can be registered.

Q. Is the keyless operation key that cannot be registered using scan tool?

YES Replace KOS-ECU and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table).
NO The procedure is complete.