Acura RL. Manual - part 164

23. Measure the resistance between the No. 14 terminal of SRS unit connector A (28P) and the No. 4

terminal of right side wire harness 4P connector C801. There should be 0-1.0 ohms.

Fig. 332: Measuring Resistance Between No. 14 Terminal Of SRS Unit Connector A (28P) And
No. 4 Terminal Of Right Side Wire Harness 4P Connector C801
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES - Open in the OPDS unit harness; replace the OPDS unit harness.

NO - Open in dashboard wire harness A or right side wire harness; replace the faulty harness.

24. Disconnect right side wire harness 4P connector (A) from the OPDS unit harness.

Fig. 333: Identifying Right Side OPDS Unit And 4P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

25. Measure the resistance between the No. 14 terminal of SRS unit connector A (28P) and body ground.

There should be an open circuit or at least 1Mohms.

2007 Acura RL

2005-08 RESTRAINTS SRS (Supplemental Restraint System) - RL

Friday, June 05, 2009 2:21:58 PM

Fig. 334: Measuring Resistance Between No. 14 Terminal Of SRS Unit Connector A (28P) And
Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES - Short to ground in the OPDS unit harness; replace the OPDS unit harness.

NO - Short to ground in dashboard wire harness A or right side wire harness; replace the faulty
harness.

DTC 81-71,81-78: FRONT PASSENGER'S WEIGHT SENSOR UNIT DOES NOT CALIBRATE;
DTC 85-71,85-78: OPDS UNIT NOT INITIALIZED

1. Clear the DTC memory (see CLEAR THE DTC MEMORY WITH THE HDS ).

2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and

then goes off.

Does the SRS indicator stay on and is DTC 81-71, 81-78, 85-71, or 85-78 indicated?

YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Go to TROUBLESHOOTING
INTERMITTENT FAILURES . If another DTC is indicated, troubleshoot the DTC.

3. Calibrate the front passenger's weight sensor unit (see FRONT PASSENGER'S WEIGHT

SENSOR UNIT CALIBRATION ) or initialize the OPDS unit (see OPDS UNIT
INITIALIZATION ).

4. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and

NOTE:



An incorrect OPDS unit can cause DTC 85-63.



A new (unintialized) OPDS unit installed with a faulty OPDS sensor can
cause DTC 85-71.



Before doing this troubleshooting procedure, review SRS Precautions
and Procedures (see PRECAUTIONS AND PROCEDURES ) and General
Troubleshooting Information (see GENERAL TROUBLESHOOTING
INFORMATION ).

2007 Acura RL

2005-08 RESTRAINTS SRS (Supplemental Restraint System) - RL

Friday, June 05, 2009 2:21:58 PM

then goes off.

Does the SRS indicator go off?

YES - The system is OK.

NO - Replace the front passenger's weight sensor unit (see FRONT PASSENGER'S WEIGHT
SENSOR UNIT REPLACEMENT ) or OPDS unit (see OPDS UNIT REPLACEMENT ) and
reset.

DTC 85-79: OPDS SENSOR INITIAL CHECK FAILURE

1. Clear the DTC memory (see CLEAR THE DTC MEMORY WITH THE HDS ).

2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and

then goes off.

Does the SRS indicator stay on, and is DTC 85-79 indicated?

YES - Turn the ignition switch OFF, and go to step 3.

NO - Intermittent failure, the system is OK at this time. Go to TROUBLESHOOTING
INTERMITTENT FAILURES . If another DTC is indicated, troubleshoot the DTC.

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

4. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and

then goes off.

Does the SRS indicator go off?

YES - The system is OK.

NO - Initialize the OPDS unit (see OPDS UNIT INITIALIZATION ).

DTC 86-1X, 86-2X ("X" CAN BE 0 THRU 9 OR A THRU F): FAULTY OPDS SENSOR

1. Clear the DTC memory (see CLEAR THE DTC MEMORY WITH THE HDS ).

2. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and

then goes off.

NOTE:

Before doing this troubleshooting procedure, review SRS Precautions and
Procedures (see PRECAUTIONS AND PROCEDURES ) and General
Troubleshooting Information (see GENERAL TROUBLESHOOTING
INFORMATION ).

NOTE:

Before doing this troubleshooting procedure, review SRS Precautions and
Procedures (see PRECAUTIONS AND PROCEDURES ) and General
Troubleshooting Information (see GENERAL TROUBLESHOOTING
INFORMATION ).

2007 Acura RL

2005-08 RESTRAINTS SRS (Supplemental Restraint System) - RL

Friday, June 05, 2009 2:21:58 PM

Does the SRS indicator stay on?

YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Go to TROUBLESHOOTING
INTERMITTENT FAILURES . If another DTC is indicated, troubleshoot the DTC.

3. Check the connections (A) at the OPDS sensor harness connectors and the OPDS unit connector (B).

Fig. 335: Identifying OPDS Sensor Harness Connectors At OPDS Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Are the connections OK?

YES - Go to step 4.

NO - Reconnect the OPDS sensor harness connectors, and clear the DTC.

4. Replace the OPDS sensor/seat-back foam (see FRONT SEAT-BACK COVER

REPLACEMENT ), and initialize the OPDS unit (see OPDS UNIT INITIALIZATION ).

5. Clear the DTC memory, then check for DTC 86-1x or 86-2x.

Is DTC 86-1 x or 86-2x indicated?

YES - Replace the OPDS unit (see OPDS UNIT REPLACEMENT ).

NO - The system is OK.

NOTE:

Aftermarket devices (fluorescent lights, laptop computers, etc.) used
near the front passenger's seat-back can interfere with the seat-back
sensors and cause a false DTC 86-1x or 86-2x. If one of these devices
was used, clear the DTC, operate the device near the seat-back, and
recheck for DTCs. If DTC 86-1x or 86-2x is reset, erase it, and do not
use the device near the seat-back.

2007 Acura RL

2005-08 RESTRAINTS SRS (Supplemental Restraint System) - RL

Friday, June 05, 2009 2:21:58 PM

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