B16A3
DTC B16A3: Turn-signal light (LH) short circuitTurn-Signal Lights (LH) Circuit:
TROUBLE JUDGMENT
When the left wiring harness of turn-signal light is short circuited, the ETACS-ECU sets DTC B16A3.
TECHNICAL DESCRIPTION (COMMENT)
When the short circuit is detected three times consecutively, the ETACS-ECU sets the DTC B16A3.
TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- Malfunction of the ETACS-ECU
DIAGNOSIS
Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Check headlight assembly (LH) connector A-31
Q: Are headlight assembly (LH) connector A-31
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection.
STEP 2. Resistance measurement at headlight assembly (LH) connector A-31
1. Disconnect the connector, and measure at the wiring harness side.
2. Measure the resistance between the connector terminal of light which does not illuminate and ground.
- Measure the resistance between the headlight assembly (LH) connector A-31 (terminal 6) and body ground.
- Measure the resistance between side turn-signal light (LH) connector A-08 (terminal 1) and body ground.
- Measure the resistance between rear combination light (LH) connector F-20 (terminal 1) and body ground.
OK: The measured value should be 2 ohms or less.
Q: Does the measured resistance value correspond with this range?
YES : Go to Step 4.
NO : Go to Step 3.
STEP 3. Check the wiring harness between headlight assembly (LH) connector A-31 (terminal 6)
- Check the ground wires for open circuit.
Q: Are the wiring harness between headlight assembly (LH) connector A-31 (terminal 6)
YES : Go to Step 6.
NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the headlights illuminate normally.
STEP 4. Check ETACS-ECU connectors C-304 and C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are ETACS-ECU connectors C-304
YES : Go to Step 5.
NO : Replace the bulb(s) of the light that does not illuminate.
STEP 5. Check the wiring harness between headlight assembly (LH) connector A-31 (terminal 3)
NOTE: Also check intermediate connector D-14 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-14 is damaged, repair or replace the connector as described in general (electrical), Harness Connector Inspection general (electrical)
- Check the communication line for open circuit.
Q: Are the wiring harness between headlight assembly (LH) connector A-31 (terminal 3)
YES : Go to Step 6.
NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the headlights illuminate normally.
STEP 6. Using scan tool MB991958, Check whether the diagnostic trouble code is reset.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958. Refer to "How to connect scan tool." Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Erase the DTC.
4. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
5. Check if DTC is set.
Q: Is the DTC set?
YES : Replace the ETACS-ECU.
NO : The procedure is complete.