INSPECTION PROCEDURE M-1: The front fog lamps do not illuminate normally.

CAUTION

Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

OPERATION

The ETACS-ECU operates this function in accordance with the input signals below.

Tail lamp switch

Headlamp switch

Front fog lamp switch

If the front fog lamps do not illuminate normally, these input signal circuit(s) or the ETACS-ECU may be defective.

POSSIBLE CAUSES

Malfunction of the column switch

Malfunction of the front fog lamp switch

Malfunction of the front-ECU

Malfunction of the ETACS-ECU

Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check that the tail lamps and headlamps operate.

Check that the tail lamps and headlamps illuminate normally.

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Repair the tail lamp(s) and headlamp(s). Refer to trouble symptom chart

Step 2. Pulse check

Check the input signals below, which are related to the fog lamps.

System switch	Check conditions
Ignition switch (IG1)	When turned from ACC to ON
Tail lamp switch	When the lighting switch is turned to the TAIL position
Headlamp switch	When the lighting switch is turned to the HEADLAMP position
Front fog lamp switch	When the front fog lamp switch is turned from off to on

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.

Q: Are the check result normal?

All the signals are received normally.: Go to Step 3

.
The ignition switch (IG1) signal is not received.: Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received"

.
The tail lamp switch signal is not received.: Refer to inspection procedure P-5 "The column switch (lighting and turn-signal lamp switch) signal is not received"

.
The headlamp switch signal is not received.: Refer to inspection procedure P-5 "The column switch (lighting and turn-signal lamp switch) signal is not received"

.
The fog lamp switch signal is not received.: Refer to inspection procedure P-18 "The front fog lamp switch signal is not received"

Step 3. Connector check: A-05X front fog lamp relay connector

Q: Is the check result normal?

YES: Go to Step 4

.
NO: Repair the connector.

Step 4. Check the front fog lamp relay.

Refer to GROUP 54A - front fog lamp

Q: Is the check result normal?

YES: Go to Step 5

.
NO: Replace the front fog lamp relay.

Step 5. Measure the voltage at the A-05X front fog lamp relay connector.