[Previous][Next]
DTC B1690: Electromagnetic interference
 
 
cautionIf DTC B1690 is set in the occupant classification-ECU, always diagnose the CAN main bus lines.
 
 
TROUBLE JUDGMENT
The above DTC is set if an abnormality is detected in the circuit inside the occupant classification-ECU.
 
 
TROUBLESHOOTING HINTS
Malfunction of the occupant classification-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the scan tool ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Check whether any electronic appliance has been put on the front passenger's seat.
Check whether any electronic appliance has been put on the front passenger's seat.
Is the check result normal?
Go to Step 3.
Replace the front seat cushion cover and pad assembly (Refer to GROUP 52A, Front Seat Assembly ).
 
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Replace the front seat cushion cover and pad assembly (Refer to GROUP 52A, Front Seat Assembly ).
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).