Acura RL. Manual - part 169

DTC B2-CX ("X" CAN BE 0 THRU 9 OR A THRU F): FAULTY POWER SUPPLY TO THE REAR
SAFING 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.

Does the SRS indicator stay on, and is DTC B2-Cx 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. Turn the ignition switch OFF. Disconnect the negative cable from the battery, then wait for 3 minutes.

4. Disconnect the left side wire harness 2P connector (A) from the rear safing sensor.

Fig. 360: Identifying Left Side Rear Safing Sensor And Wire Harness 2P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

5. Disconnect SRS unit connector C (28P) from the SRS unit (see step 7 ).

6. Measure the resistance between the No. 5 terminal of SRS unit connector C (28P) and body ground.

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

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

Fig. 361: Measuring Resistance Between No. 5 Terminal Of SRS Unit Connector C (28P) And
Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES - Go to step 7.

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

7. Measure the resistance between the No. 5 and No. 6 terminals of SRS unit connector C (28P). There

should be an open circuit or at least 1 M ohms.

Fig. 362: Measuring Resistance Between No. 5 And No. 6 Terminals Of SRS Unit Connector C
(28P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES - Faulty rear safing sensor or SRS unit; replace the rear safing sensor (see REAR SAFING
SENSOR REPLACEMENT ). If the problem is still present, replace the SRS unit (see SRS UNIT
REPLACEMENT ).

NO - Short in the left side wire harness or right side wire harness; replace the faulty harness.

DTC B2-2X, B2-8X, B2-9X, B2-BX ("X" CAN BE 0 THRU 9 OR A THRU F): INTERNAL
FAILURE OF THE REAR SAFING SENSOR

2007 Acura RL

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

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

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 B2-2x, B2-8x, B2-9x, or B2-Bx indicated?

YES - Replace the rear safing sensor (see REAR SAFING SENSOR REPLACEMENT ). If the
DTC returns, replace the SRS unit (see SRS UNIT REPLACEMENT ).

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

SYMPTOM TROUBLESHOOTING

SRS INDICATOR DOES NOT COME ON

1. Turn the ignition switch ON (II), and see if the other indicators come on (brake system, etc).

Do the other indicators come on?

YES - Go to step 2.

NO - Go to step 10.

2. Turn the ignition switch OFF, then remove the gauge control module (see CIRCUIT DIAGRAM ).

Disconnect gauge control module connector A (20P) and connector B (28P) from the gauge control
module.

Fig. 363: Identifying Gauge Control Module Connector A (20P) And Connector B (28P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

3. Measure the resistance between the No. 8 terminal of gauge control module connector A (20P) and

body ground. There should be 0-1.0 ohms.

NOTE:

2007 Acura RL

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

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

Fig. 364: Measuring Resistance Between No. 8 Terminal Of Gauge Control Module Connector
A (20P) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES - Go to step 4.

NO - Open in the dashboard wire harness A or faulty body ground terminal (G502) (see
DASHBOARD WIRE HARNESS A (LEFT BRANCH) ('06-08 MODELS) ). If the body ground
terminal is OK, replace dashboard wire harness A.

4. Measure the voltage between the No. 12 terminal of gauge control module connector A (20P) and

body ground within the first 6 seconds after turning the ignition switch ON (II). There should be about
1.0 V for 6 seconds and then about 11 V.

Fig. 365: Measuring Voltage Between No. 12 Terminal Of Gauge Control Module Connector A
(20P) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the voltage as specified?

YES - Faulty SRS indicator circuit in the gauge control module; replace the gauge control module.

NO - Go to step 5.

5. Turn the ignition switch OFF. Disconnect the negative cable from the battery, then wait for 3 minutes.

6. Disconnect SRS unit connector A (28P) from the SRS unit (see step 7 ).

7. Reconnect the negative cable to the battery.

2007 Acura RL

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

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

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