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DTC U1803: Airbag signal frame error
DTC U1804: Airbag signal parity error
DTC U1805: Airbag signal receive cycle
DTC U1806: Airbag signal data error
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets the relevant DTC when it cannot communicate with the SRS-ECU correctly.
noteWhen the SRS-ECU is replaced, DTC U1805 may be set (will be set as a historic fault after the SRS-ECU is coded).
 
 
 
PROBABLE CAUSES
  • Damaged harness or connector.
  • Malfunction of the SRS-ECU.
  • Malfunction of the PHEV-ECU.
  • Noise interruption in communication wires.
 
 
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check if DTC U1801, U1802 is set in the PHEV-ECU.
Is the DTC set?
Carry out troubleshooting for the DTC U1801 (Refer to ) or U1802 (Refer to ).
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ).
The procedure is complete.