STEP 1. Interference check at keyless operation key registration
STEP 2. Check of keyless operation key registration method
STEP 3. Using scan tool MB991958, diagnose the CAN bus line.
(1) caution | To prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (MB991958). |
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)
."
(2) Turn the power supply mode of the engine switch to ON.
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to OFF.
Is the CAN bus line found to be normal?
Go to Step 4. Repair the CAN bus line. (Refer to GROUP 54C, Diagnosis ).
STEP 4. Using scan tool MB991958, read the diagnostic trouble code.
(1) caution | To prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (MB991958). |
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)
."
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if any DTC is set to the KOS-ECU.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Refer to diagnostic trouble code chart . Go to Step 5.
STEP 5. Using scan tool MB991958, read the other system diagnostic trouble code.
(1) caution | To prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (MB991958). |
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)
."
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if any DTC is set to the OSS-ECU.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Perform troubleshooting for the OSS-ECU (Refer to diagnostic trouble code chart ). On completion, go to Step 6. Go to Step 6.
STEP 6. Replace the battery in the keyless operation key and recheck the diagnostic trouble code.
Replace the battery of the keyless operation key for which the DTC is set, and check whether the DTC is reset.(1) Turn the power supply mode of the engine switch from OFF to ON.
(2) Check if the DTC is set.
Is the DTC set?
Go to Step 7. The procedure is complete (Discharged battery).
STEP 7. Replace the keyless operation key and recheck the diagnostic trouble code.
Replace the keyless operation key for which the DTC is set with a new one, register the encrypted code and keyless operation key ID (refer to ), and check whether the DTC is reset.(1) Turn the power supply mode of the engine switch from OFF to ON.
(2) Check if the DTC is set.
Is the DTC set?
Go to Step 8. The procedure is complete.
STEP 8. Check whether the diagnostic trouble code is reset.
(1) Turn the power supply mode of the engine switch from OFF to ON.
(2) Check if the DTC is set.
Is the DTC set?
Replace KOS-ECU and register the ID codes (Refer to ). The procedure is complete.