Code No.B16A1 Tail Lamp(LH) Circuit Open
Code No.B16A8 Tail Lamp(LH) Circuit Short













DIAGNOSTIC FUNCTION


When the open circuit is detected in the taillamp circuit, the ETACS-ECU sets the diagnosis code No. B16A1. If the short circuit is detected, the diagnosis code No. B16A8 is set.

JUDGMENT CRITERIA


The problem detection of taillamp is made based on the digital feed back signal (input signal to ETACS-ECU) which operates the taillamp. When the ignition switch is ON, the ETACS-ECU determines the taillamp circuit state from the load placed on the line. After 100 ms has elapsed since the start of the check, the ETACS-ECU performs a sampling with each 10 ms. If an abnormality is detected, it increases the counter by 2, and when no abnormality is detected, it decreases the counter by 1. Once the counter reaches "10," the ETACS-ECU sets the diagnosis code No. B16A1 if the load is detected on the line, and sets the code B16A8 if no load is detected.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Connector check: D-15 rear combination lamp (LH) connector


Q. Is the check result normal?

Go to Step 2.

NO : Repair the defective connector.

STEP 2. Resistance measurement at the D-15 rear combination lamp (LH) connector


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the D-15 rear combination lamp (LH) connector terminal No. 4 and the body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 4.

Go to Step 3.

STEP 3. Wiring harness check between the D-15 rear combination lamp (LH) connector terminal No. 4 and the body earth



Q. Is the check result normal?

Go to Step 6.

Repair the wiring harness.

STEP 4. Connector check: C-311 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 5.

Repair the defective connector.

STEP 5. Wiring harness check between the D-15 rear combination lamp (LH) connector terminal No. 2 and the C-311 ETACS-ECU connector terminal No. 10



Q. Is the check result normal?

Go to Step 6.

Repair the wiring harness.

STEP 6. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?

Replace the ETACS-ECU.

The diagnosis is complete.