Inspection Procedure 7

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's 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.

TROUBLESHOOTING HINTS
- 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.








If the hood switch is damaged, repair it.

Confirm that the hood switch's input signal can be input and inspected, and confirm that the functions listed in the Technical Description (Comment) operate correctly.

If the hood switch is in good condition, go to Step 2.







STEP 2. Check the hood switch connector A-94 and ETACS-ECU connector D-26 for damage.
If the hood switch connector A-94 and ETACS-ECU connector D-26 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Confirm that the hood switch's input signal can be input and inspected, and confirm that the functions listed in the Technical Description (Comment) operate correctly.

If the connector are in good condition, go to Step 3.







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









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

If the harness wire between hood switch connector A-94 and ETACS-ECU connector D-26 is damaged, repair it.

Confirm that the hood switch's input signal can be input and inspected, and confirm that the functions listed in the Technical Description (Comment) operate correctly.

If the harness wire is in good condition, go to Step 4.

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






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

If the harness wire between hood switch connector A-94 and ground is damaged, repair it.

Confirm that the hood switch's input signal can be input and inspected, and confirm that the functions listed in the Technical Description (Comment) operate correctly.

If the harness wire is good condition, replace the ETACS-ECU. Confirm that the hood switch's input signal can be input and inspected, and confirm that the functions listed in the Technical Description (Comment) operate correctly.