Diagnosis code 79: Side Air bag Module (LH) (Squib) System Fault 5 for Power Supply Circuit diagnosis code 93: Side Air bag Module (LH) (Squib) System Fault 6 for Communication System

OPERATION

The side impact sensor includes an analog G sensor and CPU, etc. The CPU monitors the analog G sensor output signal. If the CPU judges that the side air bags should be deployed, it sends a fire signal to the SRS-ECU to deploy the side air bags. Besides that, the CPU diagnoses the internal components of the side impact sensor. If a malfunction occurs, it requests the SRS-ECU to set a diagnosis code.

DIAGNOSIS CODE SET CONDITIONS

These diagnosis codes are set if communication between the side impact sensor (LH) and the SRS-ECU is not possible or communication is faulty.

PROBABLE CAUSES

Damaged wiring harnesses or connectors

Malfunction of the side impact sensor (LH)

Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the side impact sensor (LH) (MUT-II/III diagnosis code).

Disconnect the negative battery terminal.

Replace the side impact sensor (LH) with the side impact sensor (RH).

Connect the negative battery terminal.

Erase diagnosis code memory, and check the diagnosis code.

Q: Is diagnosis code 89 or 96 set?

YES: Replace the side impact sensor (LH) with a new one (Refer to

). Then go to Step 3

.
NO: Go to Step 2

STEP 2. Check the harness wires for open circuit or short circuit between SRS-ECU connector C-114 (terminal No.34 and 36) and side impact sensor (LH) connector D-27 (terminal No.1 and 2).

NOTE: After inspecting intermediate connector D-50 inspect the wiring harness. If the intermediate connector D-50 is damaged, repair or replace it. Then go to Step 3

Q: Are the harness wires between SRS-ECU connector C-114 (terminal No.34 and 36) and side impact sensor (LH) connector D-27 (terminal No.1 and 2) in good condition?

YES: Erase the diagnosis code memory, and check the diagnosis code. If diagnosis code 79 or 93 sets, replace the SRS-ECU (Refer to

). Then go to Step 3

.
NO: Repair the harness wires between SRS-ECU connector C-114 and side impact sensor (LH) connector D-27. Then go to Step 3

STEP 3. Check whether the diagnosis code is reset.

Q: Is diagnosis code 79 or 93 set?

YES: Return to Step 1

.
NO: The procedure is complete (If no malfunctions are found in all steps, an intermittent malfunction is suspected). Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points


Diagnosis code 79: Side Air bag Module (LH) (Squib) System Fault 5 for Power Supply Circuit diagnosis code 93: Side Air bag Module (LH) (Squib) System Fault 6 for Communication System

OPERATION The side impact sensor includes an analog G sensor and CPU, etc. The CPU monitors the analog G sensor output signal. If the CPU judges that the side air bags should be deployed, it sends a fire signal to the SRS-ECU to deploy the side air bags. Besides that, the CPU diagnoses the internal components of the side impact sensor. If a malfunction occurs, it requests the SRS-ECU to set a diagnosis code.
DIAGNOSIS CODE SET CONDITIONS These diagnosis codes are set if communication between the side impact sensor (LH) and the SRS-ECU is not possible or communication is faulty.
PROBABLE CAUSES Damaged wiring harnesses or connectors Malfunction of the side impact sensor (LH) Malfunction of the SRS-ECU
	DIAGNOSIS PROCEDURE

	STEP 1. Check the side impact sensor (LH) (MUT-II/III diagnosis code). Disconnect the negative battery terminal. Replace the side impact sensor (LH) with the side impact sensor (RH). Connect the negative battery terminal. Erase diagnosis code memory, and check the diagnosis code. Q: Is diagnosis code 89 or 96 set? YES: Replace the side impact sensor (LH) with a new one (Refer to ). Then go to Step 3. NO: Go to Step 2.
	STEP 2. Check the harness wires for open circuit or short circuit between SRS-ECU connector C-114 (terminal No.34 and 36) and side impact sensor (LH) connector D-27 (terminal No.1 and 2). NOTE: After inspecting intermediate connector D-50 inspect the wiring harness. If the intermediate connector D-50 is damaged, repair or replace it. Then go to Step 3 . Q: Are the harness wires between SRS-ECU connector C-114 (terminal No.34 and 36) and side impact sensor (LH) connector D-27 (terminal No.1 and 2) in good condition? YES: Erase the diagnosis code memory, and check the diagnosis code. If diagnosis code 79 or 93 sets, replace the SRS-ECU (Refer to ). Then go to Step 3. NO: Repair the harness wires between SRS-ECU connector C-114 and side impact sensor (LH) connector D-27. Then go to Step 3.
	STEP 3. Check whether the diagnosis code is reset. Q: Is diagnosis code 79 or 93 set? YES: Return to Step 1 . NO: The procedure is complete (If no malfunctions are found in all steps, an intermittent malfunction is suspected). Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points .