TRW SRS Unit

Control System DTCs

SRS DTC Troubleshooting: 44-1x - TRW SRS unit

DTC 44-1x ("x" can be 0 thru 9 or A thru F) : No Signal From the Right Side Impact Sensor (first) (TRW SRS unit)

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 Service and Repair.
* Before doing this troubleshooting procedure, review SRS Precautions and Procedures Service and Repair, General Troubleshooting Information Reading and Clearing Diagnostic Trouble Codes, and Battery Terminal Disconnection and Reconnection Procedures.
* 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 Programming and Relearning, and retest.

1. System check:

System check
-1. Turn the ignition switch to LOCK (0).

-2. Connect the HDS to the data link connector (DLC) Reading and Clearing Diagnostic Trouble Codes.

-3. Turn the ignition switch to ON (II).

-4. From the HDS Main Menu, select SRS, then Data List. Read "ECU MAKER" displayed on the HDS.

Is TRW indicated?
-YES- Go to step 2.
-NO- Troubleshoot appropriate DTC.
CONTINENTAL SRS unit:
* DTC 44-1x Continental SRS Unit

DENSO SRS unit:
* DTC 44-1x Denso SRS Unit

2. DTC check:

DTC check
-1. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

-2. Turn the ignition switch to ON (II), then wait for 10 seconds.

-3. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

Are DTCs indicated?
-Only DTC 44-11- Go to step 3.
-DTC 44-1x (except 44-11)- Faulty right side impact sensor (first); replace the right side impact sensor (first) Side Impact Sensor (First) Removal and Installation (4-door), then clear the DTC.
-DTCs 44-11 and 46-11- Faulty right side impact sensor (first); replace the right side impact sensor (first) Side Impact Sensor (First) Removal and Installation (4-door), then clear the DTC.
-NO DTC- Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures Reading and Clearing Diagnostic Trouble Codes. If another DTC is indicated, troubleshoot the DTC.

3. Shorted wire check (RS1+ line to RS1- line):

Shorted wire check (RS1+ line to RS1- line)
-1. Turn the ignition switch to LOCK (0).

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

-3. Disconnect the following connectors.





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









Is there an open circuit, or at least 1 MOhms?
-YES- Go to step 4.
-NO- Short to another wire in the floor wire harness between the SRS unit and the right side impact sensor (first); replace the floor wire harness, then clear the DTC.

4. Shorted wire check (RS1+, RS1- lines):

Shorted wire check (RS1+, RS1- lines)
-1. Measure the resistance between test points 1 and 2.














Is there an open circuit, or at least 1 MOhms?
-YES- Go to step 5.
-NO- Short to ground in the floor wire harness between the SRS unit and the right side impact sensor (first); replace the floor wire harness, then clear the DTC.

5. Shorted wire check (RS1+, RS1- lines to power):

Shorted wire check (RS1+, RS1- lines to power)
-1. Reconnect the negative cable to the battery.

-2. Turn the ignition switch to ON (II).

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














Is there less than 0.2 V?
-YES- Go to step 6.
-NO- Short to power in the floor wire harness between the SRS unit and the right side impact sensor (first); replace the floor wire harness, then clear the DTC.

6. Open wire check (RS1+, RS1- lines):

Open wire check (RS1+, RS1- lines)
-1. Turn the ignition switch to LOCK (0).

-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 side impact sensor (first) 4P connector (B) on the floor wire harness.





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









Is there less than 1.0 Ohms?
-YES- Faulty right side impact sensor (first) or SRS unit; replace the right side impact sensor (first) Side Impact Sensor (First) Removal and Installation (4-door), then clear the DTC, and retest. If the DTC is still present, replace the SRS unit Service and Repair.
-NO- Open in the floor wire harness between the SRS unit and the right side impact sensor (first); replace the floor wire harness, then clear the DTC.