DTC 43-1x ("x" can be 0 thru 9 or A thru F): No Signal From the Left Side Impact Sensor (first); DTC 45-1x ("x" can be 0 thru 9 or A thru F): No Signal From the Left Side Impact Sensor (second)

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 45-1x (except 45-11) indicated?

YES -Faulty left side impact sensor (second); replace the left side impact sensor (second) (see SIDE IMPACT SENSOR (SECOND) REPLACEMENT ), then clear the DTC.

NO -Go to step 4.
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 43-1x (except 43-11) indicated?

YES -Faulty left side impact sensor (first); replace the left side impact sensor (first) (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ), then clear the DTC.

NO -Go to step 7.
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 45-11 indicated?

YES -Go to step 13.

NO -Go to step 10.
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 43-11 indicated?

YES -Go to step 40.

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).
Check the connections between SRS unit connector B (39P) and the SRS unit, and between the left side impact sensor (first) 4P connector on the floor wire harness and the left side impact sensor (first) (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ), and between the left side impact sensor (second) 2P connector on the floor wire harness and left side impact sensor (second) (see SIDE IMPACT SENSOR (SECOND) REPLACEMENT ).
Are the connections OK?

YES -Go to step 15.

NO -Replace the floor wire harness, then clear the DTC.
Substitute a known-good left side impact sensor (second) (see SIDE IMPACT SENSOR (SECOND) REPLACEMENT ).
Reconnect the negative cable to the 12 volt battery.
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 45-11 indicated?

YES -Go to step 20.

NO -Faulty left side impact sensor (second); replace the left side impact sensor (second) (see SIDE IMPACT SENSOR (SECOND) REPLACEMENT ), then clear the DTC.
Turn the ignition switch to LOCK (0).
Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.
Reinstall the impact sensor (second) that was substituted in step 15.
Substitute a known-good left side impact sensor (first) (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ).
Reconnect the negative cable to the 12 volt battery.
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 45-11 indicated?

YES -Go to step 28.

NO -Faulty left side impact sensor (first); replace the left side impact sensor (first) (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ), then clear the DTC.
Turn the ignition switch to LOCK (0).
Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.
Disconnect SRS unit connector B (39P) from the SRS unit (see step 10 ).
Disconnect the left side impact sensor (first) 4P connector on the floor wire harness (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ).
Disconnect the left side impact sensor (second) 2P connector on the floor wire harness (see SIDE IMPACT SENSOR (SECOND) REPLACEMENT ).
Measure the resistance between left side impact sensor (second) 2P connector on the floor wire harness terminals No. 1 and No. 2.

Fig 1: Measuring Resistance Between Left Side Impact Sensor (Second) 2P Connector On Floor Wire Harness Terminals No. 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there an open circuit or at least 1 MΩ?

YES -Go to step 34.

NO -Short to another wire in the floor wire harness between the left side impact sensor (first) and the left side impact sensor (second); replace the floor wire harness, then clear the DTC.
Measure the resistance between body ground and left side impact sensor (second) 2P connector on the floor wire harness terminals No. 1 and No. 2 individually.

Fig 2: Measuring Resistance Between Body Ground And Left Side Impact Sensor (Second) 2P Connector On Floor Wire Harness Terminals No. 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there an open circuit or at least 1 MΩ?

YES -Go to step 35.

NO -Short to ground in the floor wire harness between the left side impact sensor (first) and the left side impact sensor (second); replace the floor wire 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 left side impact sensor (second) 2P connector on the floor wire harness terminals No. 1 and No. 2 individually.

Fig 3: Measuring Voltage Between Body Ground And Left Side Impact Sensor (Second) 2P Connector On Floor Wire Harness Terminals No. 1, 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Go to step 38.

NO -Short to power in the floor wire harness between the left side impact sensor (first) and the left side impact sensor (second); replace the floor wire harness, then clear the DTC.
Turn the ignition switch to LOCK (0).
Measure the resistance between left side impact sensor (first) 4P connector on the floor wire harness terminal No. 1 and left side impact sensor (second) 2P connector on the floor wire harness terminal No. 2, and between left side impact sensor (first) 4P connector on the floor wire harness terminal No. 4 and left side impact sensor (second) 2P connector on the floor wire harness terminal No. 1.

Fig 4: Measuring Resistance Between Left Side Impact Sensor (First) 4P Connector On Floor Wire Harness Terminal No. 1 And 2P Connector On Floor Wire Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 1.0 Ω?

YES -Disconnect and reconnect the connector, and then check DTC again. If the DTC is still present, replace the SRS unit (see SRS UNIT REPLACEMENT ).

NO -Open in the floor wire harness between the left side impact sensor (first) and the left side impact sensor (second); replace the floor wire harness, then clear the DTC.
Turn the ignition switch to LOCK (0).
Check the connections between SRS unit connector B (39P) and the SRS unit, and between the left side impact sensor (first) 4P connector on the floor wire harness and the left side impact sensor (first) (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ), and between the left side impact sensor (second) 2P connector on the floor wire harness and left side impact sensor (second) (see SIDE IMPACT SENSOR (SECOND) REPLACEMENT ).
Are the connections OK?

YES -Go to step 42.

NO -Replace the floor wire harness, then clear the DTC.
Substitute a known-good left side impact sensor (first) (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ).
Reconnect the negative cable to the 12 volt battery.
Clear the DTCs with the HDS (see HOW TO CLEAR DTCS ).
Turn the ignition switch to ON (II).
Check for DTCs with the HDS (see HOW TO CLEAR DTCS ).
Is DTC 43-11 indicated?

YES -Go to step 47.

NO -Faulty left side impact sensor (first); replace the left side impact sensor (first) (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ), then clear the DTC.
Turn the ignition switch to LOCK (0).
Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.
Disconnect SRS unit connector B (39P) from the SRS unit (see step 10 ).
Disconnect the left side impact sensor (first) 4P connector on the floor wire harness (see SIDE IMPACT SENSOR (FIRST) REPLACEMENT ).
Measure the resistance between left side impact sensor (first) 4P connector on the floor wire harness terminals No. 2 and No. 3.

Fig 5: Measuring Resistance Between Left Side Impact Sensor (First) 4P Connector On Floor Wire Harness Terminals No. 2 And 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there an open circuit or at least 1 MΩ?

YES -Go to step 52.

NO -Short to another wire in the floor wire harness between the SRS unit and the left side impact sensor (first); replace the floor wire harness, then clear the DTC.
Measure the resistance between body ground and left side impact sensor (first) 4P connector on the floor wire harness terminals No. 2 and No. 3 individually.

Fig 6: Measuring Resistance Between Body Ground And Left Side Impact Sensor (First) 4P Connector On Floor Wire Harness Terminals No. 2 And 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there an open circuit or at least 1 MΩ?

YES -Go to step 53.

NO -Short to ground in the floor wire harness between the SRS unit and the left side impact sensor (first); replace the floor wire 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 left side impact sensor (first) 4P connector on the floor wire harness terminals No. 2 and No. 3 individually.

Fig 7: Measuring Voltage Between Body Ground And Left Side Impact Sensor (First) 4P Connector On Floor Wire Harness Terminals No. 2 And 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Go to step 56.

NO -Short to power in the floor wire harness between the SRS unit and the left side impact sensor (first); replace the floor wire harness, then clear the DTC.
Turn the ignition switch to LOCK (0).
Measure the resistance between left side impact sensor (first) 4P connector on the floor wire harness terminal No. 2 and SRS unit connector B (39P) terminal No. 13, and between left side impact sensor (first) 4P connector on the floor wire harness terminal No. 3 and SRS unit connector B (39P) terminal No. 12.

Fig 8: Measuring Resistance Between Left Side Impact Sensor (First) 4P Connector On Floor Wire Terminal No. 2 And SRS Unit Connector B (39P) Terminal No. 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 1.0 Ω?

YES -Disconnect and reconnect the connector, and then check DTC again. If the DTC is still present, replace the SRS unit (see SRS UNIT REPLACEMENT ).

NO -Open in the floor wire harness between the SRS unit and the left side impact sensor (first); replace the floor wire harness, then clear the DTC.