1.CHECK COMBINATION METER GROUND CIRCUIT

1. Turn the ignition switch OFF.
2. Disconnect air bag diagnosis sensor unit connector.
3. Driver seat belt is fastend.
4. Turn the ignition switch ON.
5. Check that voltage between air bag diagnosis sensor unit harness connector and ground.

(+) | (–) | Voltage (V) (Approx.)
Air bag diagnosis sensor unit
Connector | Terminal
M147 | 24 | Ground | Battery voltage

Is the inspection result normal?
YES>>Replace air bag diagnosis sensor unit.
NO>>GO TO 2.
2.CHECK COMBINATION METER GROUND CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect combination meter connector.
3. Check continuity between combination meter harness connector and air bag diagnosis sensor unit harness connector.

   Combination meter | Air bag diagnosis sensor unit | Continuity
   Connector | Terminal | Connector | Terminal
   B53 | 29 | M147 | 24 | Existed

4. Check continuity between combination meter and ground.

   Combination meter | Ground | Continuity
   Connector | Terminal
   B53 | 29 | Not existed

Is the inspection result normal?
YES>>Replace combination meter.
NO>>Repair or replace harness between combination meter and air bag diagnosis sensor unit.