Checking Wiring Harness

Under no circumstance may an ohmmeter or other current generating device be used to test resistance of the inflator module, or harness conductivity with the inflator module connected. An ohmmeter is permitted to perform resistance check of test resistor tool No. 998 8695.
A simple aid has been developed to ease fault tracing and to enable the (SRS) system to be checked before the bag assembly in installed following fault tracing or repair. The resistor has the same resistance as the bag assembly and an identical connector.
1. Checking system on completion of work. Since resistor and bag assembly possess the same resistance, the resistor can be operated by the same current which would normally deploy assembly. All fault codes should be read and corrected on completion of fault tracing or repair work prior to installing bag assembly.
2. Check crash sensor and wiring between sensor and bag assembly.
3. Ensure bag assembly is faulty by eliminating other causes.

Fig. 8 Connecting Test Resistor:

4. Connect test resistor, then attempt to clear fault codes and recheck whether codes are still displayed, Fig. 8.
5. If fault code 4 or 5 is displayed when vehicle arrives in service, after installing resistor erase fault code.
6. If fault code 4 or 5 does not reappear when resistor is connected although no repair or replacement work has been carried out, bag assembly must be replaced.
7. If fault code remains displayed after resistor has been connected wiring, contact reel or crash sensor is faulty.
8. If fault code 4 or 5 is displayed, test resistor may have operated.
9. Check resistance across terminals. Correct value is 1.8-2.5 ohms.
10. If resistor has operated, resistor is not satisfactory.
11. Check wiring or replace crash sensor. Bag assembly depolyment could occur as a result of using a current carrying devise to diagnose the (SRS) system. The inflator should be disconnected before using an ohmmeter to test components. Never use an ohmmeter to measure resistance of the bag assembly.
12. Turn ignition Off, then disconnect battery ground cable.

Fig. 9 Removing Airbag:

13. Remove bag assembly, Fig. 9.
14. Loosen driver's seat bolt and tilt backwards, then remove knee bolster and disconnect electrical connectors.
15. When measuring resistance, always measure down toward crash sensor turn ignition Off, then disconnect battery ground cable.

Checking At Contact Reel Connector

1. Extreme care is required to avoid damaging connector. Carefully insert two small steel pins (such as needles) with a maximum diameter of .040 inch in bag assembly connector.
2. Connect ohmmeter to pins and read resistance. Resistance should be approximately 200 ohms.
3. If resistance reads zero, check for short circuit. Ensure orange connector in center console is securely joined and wiring is not damaged or pinched.
4. If reading reads infinity, check for open circuit in wiring or contact reel between bag assembly and crash assembly, then check immediately following.

Checking At Upper Connector Of Wiring Harness

1. Remove orange connector at steering column.
2. Measure resistance between connector and crash sensor. Resistance should read 200 ohms.
3. If reading is not satisfactory, check at connector at center console immediately following.

Checking Center Console Connector

1. Move carpet to one side to reach connector.

Fig. 10 Checking Center Console Connector:

2. Measure resistance between connector and contact reel. Resistance should read 200 ohms, Fig. 10.
3. If reading is satisfactory, replace wiring from connector to contact reel.
4. If reading is not satisfactory, replace crash sensor.

Checking Airbag Module

1. Never use an ohmmeter to test bag assembly. In case of a bag assembly fault, as indicated by code 4 or 5, the wiring and components must be checked.
2. Connect battery ground cable, then turn ignition switch On.