DTC B1C2E: Side-airbag Module (RH) (Squib) System (Short Circuit between Squib Circuit Terminals)

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is by detecting signals from the side impact sensor installed on the lower side of the center pillar. If the impact is over a predetermined level, the SRS-ECU sends an ignition signal. At this time, if the side collision safing G-sensor is on, the SRS air bag will inflate.
  
• The ignition signal is input to the side-airbag module to inflate the side-airbag.
  

DTC SET CONDITIONS

TROUBLESHOOTING HINTS

• Improper engaged connector or defective short spring*
  
• Short between the side-airbag module (RH) (squib) circuit terminals
  
• Damaged connector(s)
  
• Malfunction of the SRS-ECU
  

note

*: The squib circuit connectors integrate a "short" spring (which prevents the air bag from deploying unintentionally due to static electricity by shorting the positive wire to the ground wire in the squib circuit when the connectors are disconnected) (Refer to ). Therefore, if connector C-30 or D-32 is damaged or improperly engaged, the short spring may not be released when the connector is connected.

(1) caution To prevent damage to scan tool MB991934, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991934. Connect scan tool MB991934. Refer to "How to connect the scan tool ." (2)Turn the ignition switch to "ON" position. (3)Diagnose the CAN bus line. (4)Turn the ignition switch to the "LOCK" (OFF) position. Q. Is the check result satisfactory? Go to Step 2. Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).

	Go to Step 3.

	There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

(2)While pressing the part A in the illustration of the C-30 SRS-ECU harness side connector, turn the lock lever toward the arrow direction to release the lock lever. Then, disconnect the connector and reconnect it.

(3)Disconnect the D-32 side-airbag module connector, and then reconnect it. Unlock the connector by sliding the locking button to the direction of the arrow as shown in the figure, and then disconnect the connector. (4)Connect the negative battery terminal. (5)Erase the diagnostic trouble code memory, and check the diagnostic trouble code. Q. Is DTC B1C2E out put? Go to Step 4. The procedure is complete. It is assumed that DTC B1C2E set because connector C-30 or D-32 was engaged improperly.

(2)Disconnect the D-32 side-airbag module connector, unlock the connector by sliding the locking button to the direction of the arrow as shown in the figure, and then disconnect the connector.

(3)Connect special tool MB991865 to special tool MB991866. (4) caution Do not insert a test probe into the terminal from its front side directly, as the connector contact pressure may be weakened. Insert special tool MB991866 into the D-32 harness side connector by backprobing. (5)Connect the negative battery terminal. (6)Erase the diagnostic trouble code memory, and check the diagnostic trouble code. Q. Is DTC B1C2E set? Go to Step 5. Replace the front seatback assembly (Refer to ) <Except RALLIART>, or replace the front seatback (Refer to ) <RALLIART>. Then go to Step 7.

(2)While pushing the part "A" indicated in the figure of the harness side connector, turn the lock lever to the direction of the arrow to release the lock lever, and disconnect the C-30 SRS-ECU connector.

(3) danger To prevent the air bag from deploying unintentionally, disconnect the side-airbag module (RH) connector D-32 to short the squib circuit. Disconnect the D-32 side-airbag module connector, unlock the connector by sliding the locking button to the direction of the arrow as shown in the figure, and then disconnect the connector.

(4) caution Insert an insulator such as a cable tie to a depth of 4mm (0.16 inch) or more, otherwise the short spring will not be released. Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick] between terminals 33, 34 and the short spring to release the short spring.

(5)Check for continuity between C-30 harness side connector terminals 33 and 34. It should be open circuit. Q. Is it open circuit? Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1C2E sets, replace the SRS-ECU (Refer to ). Then go to Step 7. Go to Step 6.

	Go to Step 7.

	Repair the harness wires between SRS-ECU connector C-30 and side-airbag module (RH) connector D-32. Then go to Step 7.

	Return to Step 1.

	The procedure is complete.