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Reading Diagnostic Trouble Codes



Self-diagnostic Procedures
The self-diagnostic function of the SRS system allows it to locate the causes of system problems and to store this information in memory. For easier troubleshooting, this data can be retrieved via the data link circuit.
- When you turn the ignition switch ON (II), the SRS indicator will come on. If it goes off after six seconds, the system is normal.
- If there is an abnormality, the system locates and defines the problem, and stores this information in memory while the SRS indicator light turns on.

NOTE: The data will remain in the memory even when the ignition switch is turned off, or if the battery is disconnected.

- When you connect the SCS service connector to the service check connector (2-P), and turn the ignition switch ON (II), the SRS indicator light will indicate the diagnostic trouble code (DTC) by the number of blinks.
- After reading and recording the DTC, proceed with the troubleshooting for this code.

Precautions
- Use only a digital multimeter to check the system. If it's not a Honda multimeter, make sure its output is 10 mA (0.01 A) or less when switched to the smallest value in the ohmmeter range. A tester with a higher output could damage the airbag circuit or cause accidental airbag deployment and possible injury.
- Whenever the ignition switch is ON (II), be careful not to bump the SRS unit; the airbags could accidentally deploy and cause damage or injuries.
- Before you remove the SRS main harness, connect the short connectors (RED) to the airbag connectors.
- Do not touch a tester probe to the terminals in the SRS unit or harness connectors, and do not connect the terminals with a jumper wire. Use only the test harness and the SCS service connectors.
- Make sure the battery is sufficiently charged.
If the battery is dead or low, or the back-up power circuit in the SRS unit is faulty, measuring values won't be correct.






Diagnostic Trouble Code (DTC
The SRS indicator light indicates the DTC by the number of blinks when the SCS service connector is connected to the service check connector.
1. With the ignition switch OFF, connect the SCS service connector to the service check connector.
2. Turn the ignition switch ON (II). The SRS indicator light comes on for about six seconds and goes off. Then it will indicate the DTC:
- The DTC consists of a main code and a sub-code.
- Including the most recent problem, up to three different malfunctions can be indicated.
- In case of a continuous failure, the DTC will be indicated repeatedly (see example 1. below).
- In case of an intermittent failure, the SRS indicator light will indicate the DTC one time, then it will stay on (see example 2. below).
- If both a continuous and an intermittent failure occur, both DTCs will be indicated as continuous failures, 1994 Model.
- If both a continuous and an intermittent failure occur, both DTCs will be indicated as continuous failures, 1995 Model (NEC) or only the DTC of the continuous failure will be indicated (DE).
- In case the system is normal is (no DTC), the SRS indicator light will start blinking continuous short blinks (see example below).






Example of DTC Indications

Troubleshooting of Intermittent Failures
If there was a malfunction, but it doesn't recur, it will be stored in the memory as an intermittent failure, and the SRS indicator light comes on.

After checking the DTC, troubleshoot as follows:
1. Record the DTC.
. Remove the SCS service connector from the service check connector.
3. Erase the DTC memory (see "Erasing the DTC Memory").
4. With the shift lever in neutral, turn the ignition switch ON (II), and let the engine idle.






5. Connect the SCS service connector to the service check connector. The SRS indicator light will blink continuous short blinks.






6. Shake the wire harness and the connector, and/or take a test drive (quick acceleration, quick braking, cornering) to find the cause of the intermittent failure. If the problem recurs, the SRS indicator light will stop blinking and stay on.
7. If you can't duplicate the intermittent failure, the system is OK at this time. Disconnect the SCS service connector.


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