DTC 41-1x ("x" can be 0 thru 9 or A thru F): No Signal From the Left Front Impact Sensor

Special Tools Required

SRS Inflator Simulator 07SAZ-TB4011A
SRS Simulator Lead L 070AZ-SNAA300

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 (see COMPONENT REPLACEMENT/INSPECTION AFTER DEPLOYMENT ).
Before doing this troubleshooting procedure, review SRS Precautions and Procedures (see PRECAUTIONS AND PROCEDURES ), General Troubleshooting Information (see DTC (DIAGNOSTIC TROUBLE CODES) ), and 12 Volt Battery Terminal Disconnection and Reconnection (see 12 VOLT 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 (see SRS UNIT UPDATE ), and retest.

Clear the DTCs with the HDS (see HOW TO CLEAR DTCS ).
Turn the ignition switch to ON (II), then wait for 10 seconds.
Check for DTCs with the HDS (see HOW TO CLEAR DTCS ).
Is DTC 41-1x indicated?

YES -Go to step 4.

NO -Intermittent failure, the system is OK at this time. Go to TROUBLESHOOTING INTERMITTENT FAILURES . If another DTC is indicated, troubleshoot the DTC.
Turn the ignition switch to LOCK (0).
Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.
Check the connections between SRS unit connector A (39P) and the SRS unit, between the left front impact sensor 2P connector and the left front impact sensor (see FRONT IMPACT SENSOR REPLACEMENT ), and at left engine compartment wire harness 4P connector.
Are the connections OK?

YES -Go to step 7.

NO -Repair the poor connections, then clear the DTC, and retest. If DTC 41-1x is still present, go to step 7.
Disconnect SRS unit connector A (39P) from the SRS unit (see step 10 ).
Disconnect the left front impact sensor 2P connector (A) from the left impact sensor (B) (see FRONT IMPACT SENSOR REPLACEMENT ).

Fig 1: Identifying Left Front Impact Sensor And 2P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the resistance between SRS unit connector A (39P) terminals No. 12 and No. 13.

Fig 2: Measuring Resistance Between SRS Unit Connector A (39P) Terminals No. 12 And No. 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there an open circuit or at least 1 MΩ?

YES -Go to step 10.

NO -Short to another wire in the left engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.
Measure the resistance between body ground and SRS unit connector A (39P) terminals No. 12 and No. 13 individually.

Fig 3: Measuring Resistance Between Body Ground And SRS Unit Connector A (39P) Terminals No. 12 And 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there an open circuit or at least 1 MΩ?

YES -Go to step 11.

NO -Short to ground in the left engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.
Reconnect the negative cable to the 12 volt battery.
Turn the ignition switch to ON (II).
Measure the voltage between body ground and SRS unit connector A (39P) terminals No. 12 and No. 13 individually.

Fig 4: Measuring Voltage Between Body Ground And SRS Unit Connector A (39P) Terminals No. 12 And 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Go to step 14.

NO -Short to power in the left engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.
Turn the ignition switch to LOCK (0).
Connect the black terminals (A) of SRS simulator lead L to the SRS inflator simulator (jumper connector), and then connect the SRS simulator lead L to the left front impact sensor 2P connector (B).

Fig 5: Connecting Black Terminals Of SRS Simulator Lead L To SRS Inflator Simulator (Jumper Connector)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the resistance between SRS unit connector A (39P) terminals No. 12 and No. 13.

Fig 6: Measuring Resistance Between SRS Unit Connector A (39P) Terminals No. 12 And No. 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 1.0 Ω?

YES -Faulty left front impact sensor or SRS unit; replace the left front impact sensor (see FRONT IMPACT SENSOR REPLACEMENT ), then clear the DTC, and retest. If the DTC is still present, replace the SRS unit (see SRS UNIT REPLACEMENT ). If the DTC is still present, replace the faulty harness.

NO -Open in the left engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.