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TROUBLESHOOTING SUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-68 CAUTION If diagnosis code B1421 is set in the combination OPERATION • The SRS-ECU judges how severe a collision is by detecting signals from the left and right side • The ignition signal is input to the side-airbag module to inflate the side-airbag. DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set if there is abnormal PROBABLE CAUSES • Open circuit in the side-airbag module (RH) (squib) circuit • Improper connector contact • Malfunction of the SRS-ECU DIAGNOSIS PROCEDURE STEP 1. MUT-III CAN bus diagnostics Use the MUT-III to diagnose the CAN bus lines. Q: Is the check result normal? YES : Go to Step 2 NO : Repair the CAN bus lines (Refer to GROUP STEP 2. Check whether the diagnosis code is Check again if the diagnosis code is set. not reset. Q: Is the diagnosis code set? YES : Go to Step 3 . NO : There is an intermittent malfunction such as STEP 3. Check the side-airbag module (RH). (2) Disconnect the side-airbag module (RH) connector D-29. (3) Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991866). CAUTION Do not insert a test probe into the terminal from harness side connector by backprobing. (5) Connect the negative battery terminal. diagnosis code. Q: Is diagnosis code B1421 set? YES : Go to Step 4. NO : Replace the seatback frame of the front AC303522 AE D-29 (R) Connector: D-29 Harness side AC006042BX MB991866 D-29 Harness side D-29 Side-airbag MB991865 (Dummy
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