Inspection Procedure 7

The Hood Switch is not input.

Hood Switch Input Circuit:

Connectors:

CIRCUIT OPERATION
The ETACS-ECU receives the input signal from the hood switch, and then judges the operation of each function.

TECHNICAL DESCRIPTION (COMMENT)
The hood switch input signal is used for judging the operation of the theft-alarm function, so if there is a malfunction, these functions may not operate correctly.
- Malfunction of the hood switch.
- Malfunction of the ETACS-ECU.
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991529: Diagnostic Trouble Code Check Harness




STEP 1. Check the hood switch.
1. Remove the hood switch
2. Check the continuity between the hood switch.

Q: Is hood switch good condition?

YES: Go to Step 2.

NO: Replace the hood switch.







STEP 2. Check the hood switch connector A-94 and ETACS-ECU connector D-26 for damage.

Q: Are hood switch connector A-94 and ETACS-ECU connector D-26 good condition?

YES: Go to Step 3.

NO: Repair or replace them. Refer to Harness Connector Inspection.










STEP 3. Check the harness wire between hood switch connector A-94 and ETACS-ECU connector D-26 for damage.

NOTE: After checking intermediate connector C-85, check the wires. If intermediate connector C-85 is damaged, repair or replace it. Refer to Harness Connector Inspection.

Q: Are the harness wire between hood switch connector A-94 and ETACS-ECU connector D-26 good condition?

YES: Go to Step 4.

NO: Repair or replace them. Refer to Harness Connector Inspection.







STEP 4. Check the harness wire between hood switch connector A-94 and ground.

NOTE: After checking joint connector (5) C-14, check the wires.
If joint connector (5) C-14 is damaged, repair or replace it. Refer to Harness Connector Inspection.

Q: Are the harness wire between hood switch connector A-94 and ground in good condition?

YES: Go to Step 5.

NO: Repair or replace them. Refer to Harness Connector Inspection.

STEP 5. Recheck for malfunction.

Q: Is a malfunction eliminated?

YES: This diagnosis is complete. (If no malfunctions are not found in all steps, an intermittent malfunction is suspected. Refer to How to Use Troubleshooting/Inspection Service Point.)

NO: Go to step 1.