DTC 45-1x: 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 .
Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information , and 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 , and retest.

1. DTC check:
1. Clear the DTCs with the HDS .

2. Turn the vehicle to the ON mode, then wait for 10 seconds.

3. Check for DTCs with the HDS .

Are DTCs indicated?

Only DTC 45-11

Go to step 2.

DTC 45-1x (except 45-11)

Replace the left side impact sensor (second) - Refer to: Side Impact Sensor (First) Removal and Installation Side Impact Sensor (Second) Removal and Installation , then clear the DTC.

NO DTC

Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures . If another DTC is indicated, troubleshoot the DTC.

2. Shorted wire check (LS2+ line to LS2- line):

1. Turn the vehicle to the OFF (LOCK) mode.

2. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

3. Disconnect the following connectors.

Left side impact sensor (first) 4P connector (on the floor wire harness)

Left side impact sensor (second) 2P connector (on the floor wire harness)

4. Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Left side impact sensor (first) 4P connector (on the floor wire harness): disconnected
	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
Test point 1	Left side impact sensor (second) 2P connector No. 1 (on the floor wire harness)
Test point 2	Left side impact sensor (second) 2P connector No. 2 (on the floor wire harness)

Courtesy of HONDA, U.S.A., INC.

Is there an open circuit, or at least 1 MΩ?

YES

The LS2+ and LS2- wires are not shorted. Go to step 3.

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.

3. Shorted wire check (LS2+, LS2- lines):

1. Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Left side impact sensor (first) 4P connector (on the floor wire harness): disconnected
	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected

Test point 1	Left side impact sensor (second) 2P connector No. 2 (on the floor wire harness)
Test point 2	Body ground

Test point 1	Left side impact sensor (second) 2P connector No. 1 (on the floor wire harness)
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there an open circuit, or at least 1 MΩ?

YES

The LS2+ and LS2- wires are not shorted. Go to step 4.

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.

4. Shorted wire check (LS2+, LS2- lines to power):

1. Reconnect the negative cable to the 12 volt battery.

2. Turn the vehicle to the ON mode.

3. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Left side impact sensor (first) 4P connector (on the floor wire harness): disconnected
	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
Test point 1	Left side impact sensor (second) 2P connector No. 2 (on the floor wire harness)
Test point 2	Body ground

Test point 1	Left side impact sensor (second) 2P connector No. 1 (on the floor wire harness)
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there 0.2 V or less?

YES

The LS2+ and LS2- wires are not shorted to power. Go to step 5.

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.

5. Open wire check (LS2+, LS2- lines):

1. Turn the vehicle to the OFF (LOCK) mode.

2. Connect terminals A and B with a jumper wire.

Terminal A	Left side impact sensor (first) 4P connector No. 1 (on the floor wire harness)
Terminal B	Left side impact sensor (first) 4P connector No. 4 (on the floor wire harness)

Courtesy of HONDA, U.S.A., INC.

3. Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Left side impact sensor (first) 4P connector (on the floor wire harness): disconnected
	Left side impact sensor (second) 2P connector (on the floor wire harness): disconnected
	Left side impact sensor (first) 4P connector terminals No. 1 and No. 4 (on the floor wire harness): jumped
Test point 1	Left side impact sensor (second) 2P connector No. 1 (on the floor wire harness)
Test point 2	Left side impact sensor (second) 2P connector No. 2 (on the floor wire harness)

Courtesy of HONDA, U.S.A., INC.

Is there 1.0 Ω or less?

YES

The LS2+ and LS2- wires are OK. Replace the left side impact sensor (second) - Refer to: Side Impact Sensor (First) Removal and Installation Side Impact Sensor (Second) Removal and Installation , then clear the DTC, and retest. If the DTC is still present, replace the SRS unit .

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.