SRS DTC 81-61, 81-62

DTC 81-61 : No Signal From the ODS Unit

DTC 81-62 : Incorrect Data From the ODS 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.
These DTCs are codes that relate to the front passenger's weight sensor operation.

DTC Description	DTC
81-61 No signal from the ODS unit
81-62 Incorrect data from the ODS 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
81-61 No signal from the ODS unit
81-62 Incorrect data from the ODS unit

Is DTC 81-61 or 81-62 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 (dashboard wire harness, floor wire harness, or front passenger's seat wire harness); replace the faulty harness, then clear the DTC, and retest. If the DTC is still present, replace the under-dash fuse/relay box , then clear the DTC.

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. Repair the poor 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
81-61 No signal from the ODS unit
81-62 Incorrect data from the ODS unit

Is DTC 81-61 or 81-62 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. From under the front passenger's seat cushion, release the elastic strap from the seat cushion frame springs .

-2. Release the bottom hooks, and unzip the seat-back cover .

-3. Turn over the seat-back cover/pad to gain access to the ODS unit .

-4. Remove the cover (A), then check the connection between the ODS unit 18P connector (B) and the ODS unit.

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Is the connector OK?

YES

Go to step 7.

NO

Go to step 6.

System check 2

-1. Repair the poor 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
81-61 No signal from the ODS unit
81-62 Incorrect data from the ODS unit

Is DTC 81-61 or 81-62 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. Remove the clip (A), then disconnect the ODS unit 18P connector (B) from the ODS unit.

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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	ODS unit 18P connector: disconnected
Test circuit	VA
Test point 1	ODS unit 18P connector No. 7 (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 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	ODS unit 18P connector: disconnected
Test circuit	GND
Test point 1	ODS unit 18P connector No. 18 (YEL)

Test point 2

Body ground

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Is there 1.0 Ω or less?

YES

The 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 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
	ODS unit 18P connector: 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 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 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
	ODS unit 18P connector: 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 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 line)

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

Test condition	OFF mode
	ODS unit 18P connector: disconnected
	SRS unit connector B (39P): disconnected
Test circuit	ODS
Test point 1	SRS unit connector B (39P) No. 21
Test point 2	ODS unit 18P connector No. 1 (BLU)

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Is there 1.0 Ω or less?

YES

The ODS wire is OK. Replace the ODS 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 ODS unit 18P connector terminal No. 1 (floor wire harness or front passenger's seat wire harness); replace the faulty harness, then clear the DTC.