B1329 FIS(Front Impact Sensor)-Driver Communication error - Automotive Repair Guides & Equipment

COMPONENT LOCATION

GENERAL DESCRIPTION

Front Impact Sensor(FIS)located at both sides of the front of engine room detects head-on collision.

When FIS delivers collision signal to SRSCM, SRSCM checks if safing sensor located in SRSCM detects collusion.

and if both FIS and safing sensor detects collision simultaneously, SRSCM operates front air bag.

DTC DESCRIPTION

The SRSCM sets DTC B1329 if there is any error in communication between DFIS and SRSCM

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

Check Data

1.	Poor connection of connected part.

2.	Faulty DFIS.

3.	Faulty SRSCM.

Enable Conditions

Ignition “ON”

Threshold Value

FIS no acceleration data, and line voltage is ok (between 3V and 11V)

Diagnostic Time

Qualification

More than 5 msec

De-Qualification

More than 10m sec

DIAGNOSTIC CIRCUIT DIAGRAM

TERMINAL AND CONNECTOR INSPECTION

1.	Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.	Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary.
	▶ Go to “Component Inspection” procedure.

COMPONENT INSPECTION

1.	Ignition “ON” & Engine “OFF” and Using a scan tool, clear the DTC.

2.	Ignition “OFF”.

3.	Disconnect the battery (-) terminal cable from the battery, and wait at least one minutes.

4.	Disconnect DFIS connector .

5.	Substitute the DFIS and check for proper operation.

Is DTC present problem ?

	▶ Substitute a known-good SRSCM, and check for proper operation. If the problem is corrected, replace SRSCM. ▶ Substitute the SRSCM main harness and check for proper operation. If the problem is corrected, replace SRSCM main harness.
	▶ Substitute a known-good DFIS, and check for proper operation. If the problem is corrected, replace DFIS.

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