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DTC B1853: Collision Signal Communication
 
 
caution
  • When you check the SRS-ECU, disconnect the negative (-) battery terminal and wait for 60 seconds or more before starting work. Insulate the disconnected (-) terminal by wrapping the tape (Refer to GROUP 52B - Service Precautions ).
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
TROUBLE JUDGMENT
Check Conditions
  • Ignition switch: ON
Judgment Criterion
  • If the collision signal error from the SRS-ECU cannot be received for 5 seconds or more.
 
 
TROUBLESHOOTING HINTS
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
  • The SRS-ECU may be defective
  • The TCU may be defective
 
 
DIAGNOSIS
STEP 1. Checking for damage to the connector and harness, which are between the SRS-ECU connector and TCU connector.
Check for damage to the connector and harness, which are between the SRS-ECU connector and TCU connector.
Is the check result normal?
Go to Step 2
Repair or replace the connector and harness.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set in the TCU.
(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) Erase the DTC.
(3) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(4) Check the DTC.
Is the DTC set?
Replace the SRS-ECU (Refer to ). Then go to Step 3.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set in the TCU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check the DTC.
Is the DTC set?
Replace the TCU (Refer to ).
The procedure is complete.