Description of On-Board Diagnostics
THE SELF DIAGNOSTIC SYSTEMThe 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 a 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, stores this information in memory, and turns the SRS indicator light 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 SRS 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.
NOTE: SRS units from three different manufacturers (DE, NEC, TAKATA) are used for the Accord. The type of SRS unit installed depends on the body type of the car. Before troubleshooting, confirm the SRS unit type by its shape and part number (see the label on top of the unit), because the DTC indications and troubleshooting procedures change with the type of the unit. The SRS unit threshold values for deploying the airbags are different for each body type; when replacing a unit, make sure to replace it with a unit of the same type.
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~ or less when switched to the smallest value in the ohmmeter range. A tester with a higher output could damage 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 SRS 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, the values measured won't be correct.
- TAKATA SRS unit: After replacing system components, erase the DTC from memory, and turn the ignition switch OFF. Wait two to three seconds, then turn the ignition switch ON (II); the SRS indicator light should come on and go off after about six seconds.
- NEC SRS unit: turn the steering wheel fully left, and keep it in this position for about 20 seconds. Then turn ii fully right and repeat; the SRS indicator light should not come on during these 40 seconds.