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Inspection Procedure 4: Keyless operation warning display does not disappear.
 
 
cautionBefore 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
STEP 1. Using scan tool MB991958, read the diagnostic trouble code.
Check the DTC B2415 is set to the KOS-ECU.
(1)
cautionTo 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 too (M.U.T.-III) ."
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC B2415 is set?
Refer to diagnostic trouble code chart .
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.
(1)
cautionTo 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 too (M.U.T.-III) ."
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC is set?
Troubleshoot the combination meter. (Refer to GROUP 54A, Diagnosis .)
Go to Step 3.
 
STEP 3. Using scan tool MB991958, read the diagnostic trouble code.
Check the DTC is set to the KOS-ECU.
(1)
cautionTo 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 too (M.U.T.-III) ."
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC is set?
Refer to diagnostic trouble code chart .
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.
Does the warning display operate properly?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace KOS-ECU and register the ID codes. (Refer to .)