SDM Power Supply and Ground Circuit Check

Precautions: Precautions for Air Bag System Service · Precautions for Handling and Storage of Air Bag System Components · Precautions for Disposal of Air Bag and Seat Belt Pretensioner · Precautions for Restraint · General safety (00)

Circuit Diagram

[A]:	“L04” connector (View: [a])	2.	“A/B” fuse	4.	Floor harness
1.	IG1 relay	3.	SDM	5.	J/B

Troubleshooting

Step	Action	Yes	No
1	Battery voltage check 1)Check battery voltage. Is voltage 10 – 14 V?	Go to Step 2.	Check charging system and repair it. •M16A model:   •K14C model:   •D16AA model:
2	SDM connection check 1)Check for proper connection to SDM connector. Is it connected securely?	Go to Step 3.	Intermittent trouble. Check for intermittent trouble.   If OK, substitute a known-good SDM and recheck connection.
3	Fuse check 1)Check that ignition is “OFF”. 2)Check “A/B” fuse. Is “A/B” fuse in good condition?	Go to Step 4.	Replace floor harness and then replace “A/B” fuse.
4	SDM power supply circuit check 1)Check that ignition is “OFF”. 2)Disconnect “L04” connector.   3)Set ignition “ON”. 4)Measure voltage between “L04-5” terminal and ground. Special Tool (A): 09932–76010 Is voltage 10 – 14 V?	Go to Step 5.	Replace floor harness.
5	Ground circuit check 1)Set ignition “OFF”. 2)Measure resistance between “L04-3” terminal and ground. Special Tool (A): 09932–76010 Is resistance 1 Ω or less?	SDM power supply circuit and ground circuit are in good condition.	Replace floor harness.