DTC 42-1x ("x" can be 0 thru 9 or A thru F): No Signal From the Right Front Impact Sensor

Special Tools Required

SRS inflator simulator 07SAZ-TB4011A
SRS simulator lead H 07YAZ-S3AA100

NOTE: Before doing this troubleshooting procedure, review SRS Precautions and Procedures (see PRECAUTIONS AND PROCEDURES ) and General Troubleshooting Information (see DTC (DIAGNOSTIC TROUBLE CODES) ).

Clear the DTC memory (see CLEAR THE DTC MEMORY WITH THE HDS ).
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 42-1 x indicated?

YES -Go to step 3.

NO -Intermittent failure, system is OK at this time. Go to TROUBLESHOOTING INTERMITTENT FAILURES . If another DTC is indicated, troubleshoot the DTC.
Turn the ignition switch OFF.
Disconnect the negative cable from the battery, then wait for 3 minutes.
Check the connections between SRS unit connector A (28P) and the SRS unit, between the engine compartment wire harness 2P connector and the right front impact sensor (see FRONT IMPACT SENSOR REPLACEMENT ), and at connector C403.
Are the connections OK?

YES -Go to step 6.

NO -Repair the poor connections and retest. If DTC 42-1x is still present, go to step 6.
Disconnect the engine compartment wire harness 2P connector (A) from the right front impact sensor.

Fig 1: Identifying Engine Compartment Wire Harness 2P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect SRS unit connector A (28P) from the SRS unit (see step 7 ).
Measure the resistance between the No. 16 and No. 28 terminals of SRS unit connector A (28P). There should be an open circuit or at least 1MΩ.

Fig 2: Measuring Resistance Between No. 16 And No. 28 Terminals Of SRS Unit Connector A (28P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES -Go to step 9.

NO -Short in the engine compartment wire harness or dashboard wire harness; replace the faulty harness.
Measure the resistance between the No. 16 terminal of SRS unit connector A (28P) and body ground, and between the No. 28 terminal and body ground. There should be an open circuit or at least 1 MΩ.

Fig 3: Measuring Resistance Between No. 16 Terminal Of SRS Unit Connector A (28P) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES -Go to step 10.

NO -Short to ground in the dashboard wire harness or engine compartment wire harness; replace the faulty harness.
Reconnect the negative cable to the battery.
Turn the ignition switch ON (II).
Measure the voltage between the No. 16 terminal of SRS unit connector A (28P) and body ground, and between the No. 28 terminal and body ground. There should be 1 V or less.

Fig 4: Measuring Voltage Between No. 16 Terminal Of SRS Unit Connector A (28P) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the voltage as specified?

YES -Go to step 13.

NO -Short to power in the engine compartment wire harness or dashboard wire harness; replace the faulty harness.
Turn the ignition switch OFF.
Connect the SRS inflator simulator (jumper connector) and simulator lead H to the engine compartment wire harness 2P connector (A).

Fig 5: Identifying Engine Compartment Wire Harness 2P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the resistance between the No. 16 and No. 28 terminals of SRS unit connector A (28P). There should be 0-1.0 Ω.

Fig 6: Measuring Resistance Between No. 16 And No. 28 Terminals Of SRS Unit Connector A (28P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance as specified?

YES -Faulty right front impact sensor or SRS unit; replace the right front impact sensor (see FRONT IMPACT SENSOR REPLACEMENT ). If the problem is still present, replace the SRS unit (see SRS UNIT REPLACEMENT ).

NO -Poor connection at C403, faulty engine compartment wire harness, or faulty dashboard wire harness. Inspect C403 (see ENGINE COMPARTMENT WIRE HARNESS (LEFT BRANCH) ). If it is OK, replace the faulty harness.