Diagnosis code 43: SRS Warning Lamp Drive Circuit System Fault 1 (Lamp does not Switch Off).

OPERATION

Power for the SRS warning lamp is supplied from the ignition switch (IG1).

The SRS warning lamp illuminates when the ignition switch is turned to the "ON" position and goes out after approximately 7 seconds if there is not a malfunction in the SRS system.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set when a short to earth occurs in the harness between the SRS warning lamp and SRS-ECU while SRS-ECU is monitoring the lamp and the lamp is ON. However, if the vehicle condition returns to normal, diagnosis code 43 will be automatically erased, and the SRS warning lamp will go out.

PROBABLE CAUSES

Damaged wiring harnesses or connectors

Malfunction of the SRS-ECU

Malfunction of the combination meter

DIAGNOSIS PROCEDURE

STEP 1. Connector check SRS-ECU connector C-115

Disconnect SRS-ECU connectors C-115.

Check the short spring for the warning lamp inside the harness side connector for improper contact or deformation.

Q: Is SRS-ECU connectors C-115 good condition?

YES: Then go to Step 2

.
NO: Repair or replace the SRS-ECU connector C-115. Then go to Step 4

STEP 2. Check the SRS warning lamp.

Disconnect the negative battery cable.

Disconnect the combination meter connector C-05.

Connect the negative battery cable.

Turn the ignition switch to the "ON" position.

Q: Does the SRS warning lamp go out?

YES: Go to Step 3

.
NO: Replace the combination meter (Refer to GROUP 54A - Combination Meters Assembly and Vehicle Speed Sensor

). Then go to Step 4

STEP 3. Check the harness for short circuit to earth between SRS-ECU connector C-115 (terminal No.8) and combination meter connector C-05 (terminal No.11).

Q: Is the harness wire between the SRS-ECU connector C-115 (terminal No.8) and combination meter connector C-05 (terminal No.11) in good condition?

YES: Erase the diagnosis code memory, and check the diagnosis code. If diagnosis code 43 sets, replace the SRS-ECU (Refer to

). Then go to Step 4

.
NO: Repair the harness wire between SRS-ECU connector C-115 and combination meter connector C-05. Then go to Step 4

STEP 4. Check whether the diagnosis code is reset.

Q: Is diagnosis code 43 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 43: SRS Warning Lamp Drive Circuit System Fault 1 (Lamp does not Switch Off).

OPERATION Power for the SRS warning lamp is supplied from the ignition switch (IG1). The SRS warning lamp illuminates when the ignition switch is turned to the "ON" position and goes out after approximately 7 seconds if there is not a malfunction in the SRS system.
DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set when a short to earth occurs in the harness between the SRS warning lamp and SRS-ECU while SRS-ECU is monitoring the lamp and the lamp is ON. However, if the vehicle condition returns to normal, diagnosis code 43 will be automatically erased, and the SRS warning lamp will go out.
PROBABLE CAUSES Damaged wiring harnesses or connectors Malfunction of the SRS-ECU Malfunction of the combination meter
	DIAGNOSIS PROCEDURE

	STEP 1. Connector check SRS-ECU connector C-115
	Disconnect SRS-ECU connectors C-115. Check the short spring for the warning lamp inside the harness side connector for improper contact or deformation. Q: Is SRS-ECU connectors C-115 good condition? YES: Then go to Step 2. NO: Repair or replace the SRS-ECU connector C-115. Then go to Step 4.
	STEP 2. Check the SRS warning lamp. Disconnect the negative battery cable. Disconnect the combination meter connector C-05. Connect the negative battery cable. Turn the ignition switch to the "ON" position. Q: Does the SRS warning lamp go out? YES: Go to Step 3 . NO: Replace the combination meter (Refer to GROUP 54A - Combination Meters Assembly and Vehicle Speed Sensor ). Then go to Step 4.
	STEP 3. Check the harness for short circuit to earth between SRS-ECU connector C-115 (terminal No.8) and combination meter connector C-05 (terminal No.11). Q: Is the harness wire between the SRS-ECU connector C-115 (terminal No.8) and combination meter connector C-05 (terminal No.11) in good condition? YES: Erase the diagnosis code memory, and check the diagnosis code. If diagnosis code 43 sets, replace the SRS-ECU (Refer to ). Then go to Step 4 . NO: Repair the harness wire between SRS-ECU connector C-115 and combination meter connector C-05. Then go to Step 4.
	STEP 4. Check whether the diagnosis code is reset. Q: Is diagnosis code 43 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 .