DTC B00A0-87

DTC B00A0-87 : Lost Communication With the Front Passenger's Weight Sensor Unit

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 that they were properly installed .
Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information , and 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.
Before replacing the front passenger's weight sensor unit, check the front passenger's weight sensor unit software version with the HDS. If the software version is not the latest, update the front passenger's weight sensor unit software , and retest.

DTC Description	DTC
B00A0-87 Lost communication with the front passenger's weight sensor unit

DTC (SRS)

Problem verification

-1. Make sure nothing is on the front passenger's seat.

-2. Clear the DTCs with the HDS .

-3. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.

-4. Check for DTCs with the HDS .

DTC Description	DTC
B00A0-87 Lost communication with the front passenger's weight sensor unit

Is DTC B00A0-87 indicated?

YES

The failure is duplicated. Go to step 2.

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

Fuse check

-1. Press the engine start/stop button to select the OFF mode.

-2. Check the following fuse.

Fuse	No. B29 (7.5 A)
Location	Under-dash fuse/relay box

Is the fuse OK?

YES

Go to step 3.

Replace the fuse, then press the engine start/stop button to select the ON mode. If the fuse blows again, check for a short to ground in the under-dash fuse/relay box No. B29 (7.5 A) fuse circuit; replace the faulty harness, and retest. If the problem is still present, replace the under-dash fuse/relay box .

Connector connection check 1
-1. From under the front passenger's seat, check the connection of the connector (A) between the floor wire harness and the front passenger's seat wire harness.

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Is the connector OK?

YES

Go to step 5.

NO

Go to step 4.

System check 1

-1. Reset the loose connector connection which was the cause of the problem in step 3.

-2. Clear the DTCs with the HDS .

-3. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.

-4. Check for DTCs with the HDS .

DTC Description	DTC
B00A0-87 Lost communication with the front passenger's weight sensor unit

Is DTC B00A0-87 indicated?

YES

Press the engine start/stop button to select the OFF mode, then go to step 5.

The system is OK at this time.

Connector connection check 2
-1. Check the connection between the front passenger's weight sensor unit connector A (6P) and the front passenger's weight sensor unit.

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Is the connector OK?

YES

Go to step 7.

NO

Go to step 6.

System check 2

-1. Reset the loose connector connection which was the cause of the problem in step 5.

-2. Clear the DTCs with the HDS .

-3. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.

-4. Check for DTCs with the HDS .

DTC Description	DTC
B00A0-87 Lost communication with the front passenger's weight sensor unit

Is DTC B00A0-87 indicated?

YES

Press the engine start/stop button to select the OFF mode, then go to step 7.

The system is OK at this time.

Open wire check (VA line)

-1. Disconnect front passenger's weight sensor unit connector A (6P).

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-2. Press the engine start/stop button to select the ON mode.

-3. Measure the voltage between test points 1 and 2.

Test condition	ON mode
Test condition	Front passenger's weight sensor unit connector A (6P): disconnected
Test circuit	VA
Test point 1	Front passenger's weight sensor unit connector A (6P) No. 3 (GRN)
Test point 2	Body ground

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Is there battery voltage?

YES

The VA wire is OK. Go to step 8.

Open in the floor wire harness, the front passenger's seat wire harness, or faulty under-dash fuse/relay box; replace the faulty harness or the under-dash fuse/relay box , then clear the DTC.

Open wire check (GND/SWS GND line)

-1. Press the engine start/stop button to select the OFF mode.

-2. Measure the resistance between test points 1 and 2.

Test condition	OFF mode
Test condition	Front passenger's weight sensor unit connector A (6P): disconnected
Test circuit	SWS GND
Test point 1	Front passenger's weight sensor unit connector A (6P) No. 1 (YEL)
Test point 2	Body ground

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Is there 1.0 Ω or less?

YES

The GND/SWS GND wire is OK. Go to step 9.

Open in the floor wire harness or the front passenger's seat wire harness; check for a poor ground at G602. If the ground is OK, replace the faulty harness, then clear the DTC.

Shorted wire check (ODS/SWS ODUS line)

-1. Disconnect the negative cable from the battery, then wait at least 3 minutes.

-2. Disconnect the following connector.

SRS unit connector B (39P)

-3. Measure the resistance between test points 1 and 2.

Test condition	OFF mode
	Front passenger's weight sensor unit connector A (6P): disconnected
	SRS unit connector B (39P): disconnected
Test circuit	ODS
Test point 1	SRS unit connector B (39P) No. 21
Test point 2	Body ground

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Is there an open circuit, or at least 1 MΩ?

YES

The ODS/SWS ODUS wire is not shorted. Go to step 10.

Short to ground in the floor wire harness or the front passenger's seat wire harness; replace the faulty harness, then clear the DTC.

Shorted wire check (ODS/SWS ODUS line to power)

-1. Reconnect the negative cable to the battery.

-2. Press the engine start/stop button to select the ON mode.

-3. Measure the voltage between test points 1 and 2.

Test condition	ON mode
	Front passenger's weight sensor unit connector A (6P): disconnected
	SRS unit connector B (39P): disconnected
Test circuit	ODS
Test point 1	SRS unit connector B (39P) No. 21
Test point 2	Body ground

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Is there 0.2 V or less?

YES

The ODS/SWS ODUS wire is not shorted to power. Go to step 11.

Short to power in the floor wire harness or the front passenger's seat wire harness; replace the faulty harness, then clear the DTC.

Open wire check (ODS/SWS ODUS line)

-1. Press the engine start/stop button to select the OFF mode.

-2. Measure the resistance between test points 1 and 2.

Test condition	OFF mode
	Front passenger's weight sensor unit connector A (6P): disconnected
	SRS unit connector B (39P): disconnected
Test circuit	ODS/SWS ODUS
Test point 1	SRS unit connector B (39P) No. 21
Test point 2	Front passenger's weight sensor unit connector A (6P) No. 4 (BLU)

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Is there 1.0 Ω or less?

YES

The ODS/SWS ODUS wire is OK. Replace the front passenger's weight sensor unit , then clear the DTC, and retest. If the DTC is still present, replace the SRS unit .

Open in the harness between SRS unit connector B (39P) terminal No. 21 and front passenger's weight sensor unit connector A (6P) terminal No. 4 (floor wire harness or front passenger's seat wire harness); replace the faulty harness, then clear the DTC.