SDM Cannot Communicate through the Serial Data Circuit

SDM Cannot Communicate through the Serial Data Circuit

Wiring Diagram:

Wiring Diagram

CAUTION:
- Be sure to perform Air Bag Diagnostic System Check:Except Advanced Air Bag before starting diagnosis according to flow. Air Bag Diagnostic System Check
- When measurement of resistance or voltage is required in this flow, use a specified digital multimeter (Refer to Special Tool:Except Advanced Air Bag.) along with a correct terminal adapter from special tool (Connector test adapter kit).
- When a check for proper connection is required, refer to Inspection of Intermittents and Poor Connections:Except Advanced Air Bag. Inspection of Intermittents and Poor Connections
- If there is open circuit in the air bag wire harness, connector or terminal is found damaged, replace the wire harness, connector and terminal as an assembly.

Flow Test Description
STEP 1: An improper connection to the data link connector (DLC) will prevent communications from being established.
STEP 2: This test checks whether it is possible to communicate with other control module.
STEP 3: This test checks for an open in Serial data circuit.

Step 1:

Step 2 - 3:

Troubleshooting