INSPECTION PROCEDURE B-3: R (reverse) position warning function does not work.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

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

Ignition switch (IG1)

Park/neutral switch ("R" position)

If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective.

POSSIBLE CAUSES

Malfunction of the inhibitor switch

Malfunction of the ETACS-ECU

Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ECU check on the SWS monitor

Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

Ignition switch: ON

ECUS TO BE CHECKED

ETACS ECU

OK: "OK" is displayed on the "ETACS ECU" menu.

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible"

Step 2. Function diagnosis by using the SWS monitor

Check the SWS communication signal, which are related to the R (reverse) position warning function.

<Selected item> BUZZER - REVERSE ALRM

Ignition switch: ON

Inhibitor switch: R (reverse) position

Item No.	Item name	Normal conditions
Item 30	IG SW(IG1)	ON
Item 41	INHIBITOR SW	ON
Item 43	BUZZER	ON

OK: Normal conditions are displayed for all the items.

Q: Are the check result normal?

Normal conditions displayed for all the items: Go to Step 3

.
Normal condition is not displayed for item No.30: Refer to inspection procedure P-2 "The ignition switch (IG1) signal is not received"

.
Normal condition is not displayed for item No.41: Refer to inspection procedure P-3 "The inhibitor switch (reverse position) signal is not received"

.
Normal condition is not displayed for item No.43: Replace the ETACS-ECU.

Step 3. Retest the system.

Check that the R (reverse) position warning function works normally.

Q: Is the check result normal?

YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction

).
NO: Replace the ETACS-ECU.