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DTC B1762: IOD fuse not seated fully
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
DTC SET CONDITION
  • When voltage at the power supply fuse (fuse No. BF3) drops below 5 V with the electric motor switch ON and then the ACC OFF signal is detected for 5 seconds, the ETACS-ECU will store DTC No. B1762.
 
 
TROUBLESHOOTING HINTS
  • The fuse No. BF3 may be defective
  • The ETACS-ECU may be defective
  • The OSS-ECU may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
DIAGNOSIS
Required Special Tools:
  • MB992006: Extra fine probe
  • MB991223: Harness set
STEP 1. Check the power supply fuses (fuse No. BF3).
Check the power supply fuses (fuse No. BF3). (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Inspection Service Points for a Blown Fuse .)
Is the fuse in good condition?
Go to Step 2
Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - Inspection Service Points for a Blown Fuse .
 
STEP 2. Check of short to power supply, short to ground, and open circuit in IODI line between fusible link and ETACS-ECU connector.
Is the check result normal?
Go to Step 3
: Repair the connector(s) or wiring harness.
 
STEP 3. Using scan tool (M.U.T.-IIISE), read the OSS DTC.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch 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) Check that the OSS-ECU set a DTC.
Is the DTC set?
Diagnose the OSS-ECU. Refer to GROUP 42B, Troubleshooting .
Go to Step 4
 
STEP 4. Check of short to power supply, short to ground, and open circuit in ACC line between OSS-ECU (ACC) and ETACS-ECU connector.
Is the check result normal?
Go to Step 5
Repair the connector(s) or wiring harness.
 
STEP 5. Recheck for DTC.
Check again if the DTC is set in the ETACS-ECU.
(1) Erase the DTC.
(2) Press the electric motor switch to turn the power supply mode from "OFF" to "ON."
(3) Check if DTC.
Is the DTC set?
Replace the ETACS-ECU.
If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring harness is suspected. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)