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Inspection Procedure 13: Front seat belt reminder function does not work normally (driver’s side).
 
 
cautionBefore replacing the combination meter, be sure to check that the power supply circuit, ground circuit, and communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the seat belt reminder function (driver’s side) does not work normally, the seat belt switch input circuit, or the combination meter may be defective.
 
 
TROUBLESHOOTING HINTS
  • The CAN bus line may be defective
  • The seat belt switch (driver's side) may be defective
  • The combination meter may be defective
  • Damaged harness wires and connectors
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(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 - Troubleshooting - CAN Bus Diagnostics Table ).
 
STEP 2. Check the seat belt switch (driver’s side).
Check the seat belt switch (driver’s side). Refer to GROUP 52A - Front Seat Belt .
Is the check result normal?
Go to Step 3.
Replace the seat belt switch or the front seat pad (with front seat belt reminder sensor).
 
STEP 3. Resistance measurement at the seat belt switch (driver’s side) connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the seat belt switch (driver’s side) connector (ground terminals) and the body ground.
OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 5.
Go to Step 4.
 
STEP 4. Check of short, open circuit in body ground line between seat belt switch (driver’s side) connector and the body ground.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
 
STEP 5. Check of short to power supply circuit in SBDS line between combination meter connector and seat belt switch (driver’s side) connector.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
 
STEP 6. Retest the system.
The seat belt reminder function (driver’s side) should work normally.
Is the check result normal?
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 the combination meter.