Code No.B16A7
Tail lamp (RH) circuit short <Short circuit in the position lamp (RH) circuit or the
tail lamp (RH) circuit>
caution |
- Before
replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication
circuit are normal.
- When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition
key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine
cannot be started. Register the encrypted code as described in Immobilizer System - How
to Register Key ID
.)
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DIAGNOSTIC FUNCTION
When a short circuit is detected in the position lamp circuit or the tail lamp circuit,
the ETACS-ECU sets the diagnosis code No. B16A7.
JUDGEMENT CRITERIA
The problem detection of tail lamp is made based on the digital feed back signal (input
signal to ETACS-ECU) which operates the tail lamp. When the ignition switch is ON, the ETACS-ECU
determines the tail lamp 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. B16A7
if no load is detected.
PROBABLE CAUSES
- Malfunction of bulbs
- Damaged harness wires and connectors
- Malfunction of the ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Bulb check
Check the bulb(s) of the lamp that does not illuminate.
Q.
Is the check result normal?
Go to Step 2.
Replace the bulb(s) of the lamp that does not illuminate.
STEP 2. Resistance measurement at the headlamp assembly (position:
RH) connector, rear combination lamp (tail: RH) connector (earth terminals).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the connector terminal of lamp which does not illuminate
and the body earth.
- Measure the resistance between the headlamp assembly (position: RH) connector (earth
terminal) and body earth.
- Measure the resistance between the rear combination lamp (tail: RH) connector (earth terminal)
and body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 4.
Go to Step 3.
STEP 3. Check of open circuit in earth lines between the headlamp
assembly (position: RH) connector , rear combination lamp (tail: RH) connector and body earth.
Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 4. Check of short to power supply, short to earth, and open circuit
in (TAR1, TAR2) lines between the headlamp assembly (position: RH) connector , rear combination
lamp (tail: RH) connector and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the ETACS-ECU.
The diagnosis is complete.