DTC Troubleshooting: B0072-2B

DTC B0072-2B: Short to Another Wire Harness in the Front Passenger's Seat Belt Tensioner

NOTE:

	Before doing this troubleshooting procedure, find out if the vehicle was in a collision. If so, verify that all the required components were replaced with new components of the correct part number and were properly installed.
	Before doing this troubleshooting procedure, review SRS Precautions and Procedures, General Troubleshooting Information, and 12 Volt Battery Terminal Disconnection and Reconnection.
	Before replacing the SRS unit, check the SRS unit software version with the HDS. If the software version is not the latest, update the SRS unit software, and retest.

DTC Description	DTC
B0072-2B Short to another wire harness in the front passenger's seat belt tensioner

Problem verification:

Problem verification

?1.	Clear the DTCs with the HDS.

?2.	Turn the vehicle to the ON mode, then wait for 10 seconds.

?3.

Check for DTCs with the HDS.

DTC Description	DTC
B0072-2B Short to another wire harness in the front passenger's seat belt tensioner

Is DTC B0072-2B indicated?


	YES

The failure is duplicated. Go to step 2.


	NO

Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.?

DTC check:

DTC check

?1.

Check for DTCs with the HDS.

DTC Description	DTC
B0020-2B Short to another wire harness in the driver's side airbag inflator
B0021-2B Short to another wire harness in the left side curtain airbag first inflator
B0028-2B Short to another wire harness in the front passenger's airbag inflator
B0029-2B Short to another wire harness in the right side curtain airbag first inflator
B0070-2B Short to another wire harness in the driver's seat belt tensioner
B0072-2B Short to another wire harness in the front passenger's seat belt tensioner

Is DTC B0020-2B, B0021-2B, B0028-2B, B0029-2B, or B0070-2B indicated with DTC B0072-2B?


	YES

Go to step 3.


	NO

Short to another wire in the left or right side wire harness; replace the faulty harness, then clear the DTC.?

Shorted wire check (RRP lines to another line):

Shorted wire check (RRP lines to another line)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.	Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

?3.

Disconnect the following connector.

SRS unit connector B (39P)

?4.

Check for continuity between test points 1 and 2 of SRS unit connector B (39P) according to table.

Test condition	Vehicle OFF (LOCK) mode
	SRS unit connector B (39P): disconnected

DTC	SRS unit connector B (39P)
	Test point 1	Test point 2
	From terminal	To terminal
B0020-2B	No. 19	No. 5
B0020-2B	No. 18	No. 6
B0021-2B	No. 19	No. 9
B0021-2B	No. 18	No. 10
B0028-2B	No. 19	No. 4
B0028-2B	No. 18	No. 3
B0029-2B	No. 19	No. 8
B0029-2B	No. 18	No. 7
B0070-2B	No. 19	No. 20
B0070-2B	No. 18	No. 21

Is there continuity?


	YES

Short to another wire in the left or right side wire harness; replace the faulty harness, then clear the DTC.?


	NO

The RRP wires are OK. Faulty SRS unit or poor connection at SRS unit connector B (39P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit. If the DTC does not clear, replace the left or right side wire harness.?