Inspection Procedure 4
Inspection Procedure 4: Keyless operation warning display does not disappear.
CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
TROUBLESHOOTING HINTS
- Malfunction of CAN bus line
- Malfunction of combination meter
- Damaged wiring harness and connectors
- Malfunction of the KOS-ECU
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
STEP 1. Using scan tool MB991958, read the diagnostic trouble code.
Check if DTC B2415 is set to the KOS-ECU.
(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes".
(2)Turn the ignition switch to the "ON" position.
(3)Check if DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is DTC B2415 set?
YES Refer to Keyless Operation System (KOS).
NO Go to Step 2.
STEP 2. Using scan tool MB991958, read the combination meter diagnostic trouble code.
Check if DTC is set in the combination meter.
Q. Is the DTC set?
YES Troubleshoot the combination meter. Combination Meter).
NO Go to Step 3.
STEP 3. Using scan tool MB991958, read the KOS-ECU trouble code.
Check if DTC is set to the KOS-ECU.
Q. Is the DTC set?
YES Refer to Keyless Operation System (KOS).
NO Go to Step 4.
STEP 4. Check of the troubles.
Check that the keyless operation warning display turns OFF unless the flashing or illumination conditions are met.
Q. Does the warning display operate properly?
YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace KOS-ECU and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table).