SRS DTC 42-1x
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 L 070AZ-SNAA300
- 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 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.
- Circuit of the front impact sensor has a automatic short connector in the dashboard wire harness between dashboard wire harness and engine compartment wire harness. When check the dashboard wire harness, connect it to known-good engine compartment wire harness to cancel automatic shorting, and use a back probe adapter.
| DTC Description | DTC |
|---|---|
DTC (SRS)
- Problem verification
-1. Clear the DTCs with the HDS .
-2. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.
-3. Check for DTCs with the HDS .
DTC Description DTC Is DTC 42-1x 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. Press the engine start/stop button to select the OFF mode.
-2. Check the following connector connections.
SRS unit connector A (39P) Right front impact sensor 2P connector (on the engine compartment wire harness) Connector between the SRS unit and the right 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. Press the engine start/stop button to select the ON mode, then wait for 10 seconds.
-4. Check for DTCs with the HDS .
DTC Description DTC Is DTC 42-1x indicated?
YES
Press the engine start/stop button to select the OFF mode, then go to step 4.
NO
The system is OK at this time.
- Shorted wire check (RFS+ line to RFS- 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) Right front impact sensor 2P connector (on the engine compartment wire harness) -3. Measure the resistance between test points 1 and 2.
Test condition OFF mode SRS unit connector A (39P): disconnected Right front impact sensor 2P connector (on the engine compartment wire harness): disconnected Test circuit RFS+, RFS- Test point 1 SRS unit connector A (39P) No. 26 Test point 2 SRS unit connector A (39P) No. 27 Is there an open circuit, or at least 1 MΩ?
YES
The RFS+ and RFS- wires are not shorted. Go to step 5.
NO
Short to another wire in the engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.
- Shorted wire check (RFS+, RFS- lines)
-1. Measure the resistance between test points 1 and 2.
Test condition OFF mode SRS unit connector A (39P): disconnected Right front impact sensor 2P connector (on the engine compartment wire harness): disconnected Test circuit RFS+ Test point 1 SRS unit connector A (39P) No. 26 Test point 2 Body ground Test circuit RFS- Test point 1 SRS unit connector A (39P) No. 27 Test point 2 Body ground Is there an open circuit, or at least 1 MΩ?
YES
The RFS+ and RFS- wires are not shorted. Go to step 6.
NO
Short to ground in the engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.
- Shorted wire check (RFS+, RFS- lines to power)
-1. Reconnect the negative cable to the battery.
-2. Press the engine start/stop button to select the ON mode.
-3. Measure the voltage between test points 1 and 2.
Test condition ON mode SRS unit connector A (39P): disconnected Right front impact sensor 2P connector (on the engine compartment wire harness): disconnected Test circuit RFS+ Test point 1 SRS unit connector A (39P) No. 26 Test point 2 Body ground Test circuit RFS- Test point 1 SRS unit connector A (39P) No. 27 Test point 2 Body ground Is there 0.2 V or less?
YES
The RFS+ and RFS- wires are not shorted to power. Go to step 7.
NO
Short to power in the engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.
- Open wire check (RFS+, RFS- lines)
-1. Press the engine start/stop button to select the OFF 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 right front impact sensor 2P connector (B) on the engine compartment wire harness.
-3. Measure the resistance between test points 1 and 2.
Test condition OFF mode SRS unit connector A (39P): disconnected Right front impact sensor 2P connector (on the engine compartment wire harness): disconnected Right front impact sensor 2P connector (on the engine compartment wire harness): connected to SRS simulator lead L Test circuit RFS+, RFS- Test point 1 SRS unit connector A (39P) No. 26 Test point 2 SRS unit connector A (39P) No. 27 Is there 1.0 Ω or less?
YES
The RFS+ and RFS- wires are OK. Replace the right front impact sensor , then clear the DTC, and retest. If the DTC is still present, replace the SRS unit .
NO
Open in the engine compartment wire harness or the dashboard wire harness; replace the faulty harness, then clear the DTC.