DTC B0090-87 (2014 2015 2016)
DTC B0090-87 : No Signal From the Left Front Impact Sensor
Special Tools Required
-SRS Inflator Simulator 07SAZ-TB4011A
-SRS Simulator Lead L 070AZ-SNAA300
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information , and Battery Terminal Disconnection and Reconnection - Refer to: Battery Terminal Disconnection and Reconnection (2016), or Battery Terminal Disconnection and Reconnection (2014 2015) .
- 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.
| DTC Description | DTC |
|---|---|
| B0090-87 No signal from the left front impact sensor |
DTC (SRS)
- Problem verification
-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.
DTC Description DTC B0090-87 No signal from the left front impact sensor Is DTC B0090-87 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures . If another DTC is indicated, troubleshoot the DTC.
- Connector connection check
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Check the following connector connections.
SRS unit connector A (39P) - Refer to: SRS Unit Removal and Installation Left front impact sensor 2P connector (on the left engine compartment wire harness) Connector between the SRS unit and the left front impact sensor Are the connectors OK?
YES
Go to step 4.
NO
Go to step 3.
- System check
-1. Repair the poor connector connections whichever was the cause of the problem in step 2.
- 2. Clear the DTCs with the HDS.
- 3. Turn the vehicle to the ON mode, then wait for 10 seconds.
- 4. Check for DTCs with the HDS.
DTC Description DTC B0090-87 No signal from the left front impact sensor Is DTC B0090-87 indicated?
YES
Turn the vehicle to the OFF (LOCK) mode, then go to step 4.
NO
The system is OK at this time.
- Shorted wire check (LFS+ line to LFS- line)
-1. Disconnect the negative cable from the battery, then wait at least 3 minutes.
- 2. Disconnect the following connectors.
SRS unit connector A (39P) - Refer to: SRS Unit Removal and Installation Left front impact sensor 2P connector (on the left engine compartment wire harness) - 3. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode SRS unit connector A (39P): disconnected Left front impact sensor 2P connector (on the left engine compartment wire harness): disconnected Test circuit LFS+, LFS- Test point 1 SRS unit connector A (39P) No. 28 Test point 2 SRS unit connector A (39P) No. 29 Is there an open circuit, or at least 1 MΩ?
YES
The LFS+ and LFS- wires are not shorted. Go to step 5.
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.
- Shorted wire check (LFS+, LFS- lines)
-1. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode SRS unit connector A (39P): disconnected Left front impact sensor 2P connector (on the left engine compartment wire harness): disconnected Test circuit LFS+ Test point 1 SRS unit connector A (39P) No. 28 Test point 2 Body ground Test circuit LFS- Test point 1 SRS unit connector A (39P) No. 29 Test point 2 Body ground Is there an open circuit, or at least 1 MΩ?
YES
The LFS+ and LFS- wires are not shorted. Go to step 6.
NO
Short to ground in the left engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.
- Shorted wire check (LFS+, LFS- lines to power)
-1. Reconnect the negative cable to the battery.
- 2. Turn the vehicle to the ON mode.
- 3. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode SRS unit connector A (39P): disconnected Left front impact sensor 2P connector (on the left engine compartment wire harness): disconnected Test circuit LFS+ Test point 1 SRS unit connector A (39P) No. 28 Test point 2 Body ground Test circuit LFS- Test point 1 SRS unit connector A (39P) No. 29 Test point 2 Body ground Is there 0.2 V or less?
YES
The LFS+ and LFS- wires are not shorted to power. Go to step 7.
NO
Short to power in the left engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.
- Open wire check (LFS+, LFS- lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Connect the black terminal (A) of SRS simulator lead L to the SRS inflator simulator (jumper connector), then connect SRS simulator lead L to the left front impact sensor 2P connector (B) on the left engine compartment wire harness.
- 3. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode SRS unit connector A (39P): disconnected Left front impact sensor 2P connector (on the left engine compartment wire harness): disconnected Left front impact sensor 2P connector (on the left engine compartment wire harness): connected to SRS simulator lead L Test circuit LFS+, LFS- Test point 1 SRS unit connector A (39P) No. 28 Test point 2 SRS unit connector A (39P) No. 29 Is there 1.0 Ω or less?
YES
The LFS+ and LFS- wires are OK. Replace the left front impact sensor , then clear the DTC, and retest. If the DTC is still present, replace the SRS unit - Refer to: SRS Unit Removal and Installation, .
NO
Open in the left engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.