Seat Occupant Classification Module - Air Bag: Testing and Inspection

OCM Power Supply and Ground Circuit Check

Wiring Diagram










Troubleshooting



1. Battery voltage check

Measure voltage on battery.

Is voltage in 9 - 16 V?
YES
Go to Step 2.
NO
Check charging system and repair as necessary referring to Generator Test.

2. Connection check

Check for loose each connection.

Is it connected securely?
YES
Go to Step 3.
NO
Intermittent trouble. Check for intermittent trouble referring to Inspection of Intermittent and Poor Connections:Advanced Air Bag
If OK, substitute a known-good SDM and recheck.

3. Circuit fuse check

With ignition switch turned OFF, check "A/B" fuse for blowing.

Is "A/B" fuse in good condition?
YES
Go to Step 4.
NO
Repair defective wire circuit. After repaired, replace "A/B" fuse.

4. OCM with sensor mat power supply voltage check

With ignition switch turned OFF, disconnect OCM connector.
Check for proper connection to OCM terminal at "L08-2".
With ignition switch turned ON, measure voltage between "L08-2" terminal and body ground.
Special Tool

(A): 09932-76010





Is voltage in 10 - 14 V?
YES
Go to Step 5.
NO
Repair defective wire circuit.

5. OCM with sensor mat ground circuit check

With ignition switch turned OFF, disconnect SDM connector "L04".
Check for proper connection to OCM terminal at "L08-3".
Check for proper connection to SDM terminal at "L04-43".
Measure resistance between "L04-43" and "L08-3" terminals.
Special Tool

(A): 09932-76010





Is each measured resistance 1ohms or less?
YES
OCM power supply and ground circuit is good condition.
NO
Repair defective wire circuit.