Pinpoint Test N: One Turn Signal/Hazard Lamp Is Inoperative/Always On

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

N1 DETERMINE IF A TURN LAMP IS ALWAYS ON
- Key in ON position.
- Monitor the turn lamps while placing the multifunction switch in the RH TURN, LH TURN and NEUTRAL positions.
- Is any turn lamp always on?
Yes : GO to N4.

No : GO to N2.

N2 CHECK THE TURN LAMP GROUND CIRCUITRY FOR AN OPEN

Key in OFF position.
Disconnect: Inoperative Turn Lamp.

Measure the resistance between the inoperative turn lamp, harness side and ground as follows:

CONNECTOR-PIN SPECIFICATION

Inoperative Turn Lamp	Connector-Pin	Circuit
LH front (Fusion, Milan)	C1023-1	GD123 (BK/YE)
RH front (Fusion, Milan)	C1043-1	GD121 (BK/RD)
LH front (Zephyr without high intensity discharge [HID] headlamps)	C1023-1	GD123 (BK/YE)
RH front (Zephyr without HID headlamps)	C1043-1	GD121 (BK/GY)
LH front (Zephyr with HID headlamps)	C156-1	GD123 (BK/YE)
RH front (Zephyr with HID headlamps)	C166-1	GD121 (BK/GY)
LH rear (Milan, Zephyr)	C413-1	GD171 (BK/GY)
RH rear (Milan, Zephyr)	C416-1	GD171 (BK/GY)

Is the resistance less than 5 ohms?

Yes : GO to N3.

No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test

N3 CHECK THE TURN LAMP VOLTAGE SUPPLY CIRCUITRY FOR AN OPEN AND A SHORT TO GROUND

Disconnect: SJB C2280e (Rear Lamp) or C2280a (Front Lamp).

Measure the resistance between the inoperative turn lamp, harness side and the SJB, harness side; and between the inoperative turn lamp, harness side and ground as follows:

SJB CONNECTOR-PIN SPECIFICATION

Inoperative Turn Lamp Connector-Pin	SJB Connector-Pin	Circuit
LH front (without HID headlamps) J1023-3	C2280a-21	CLS21 (BU/GN)
RH front (without HID headlamps)	C2280a-9	CLS25 (YE/VT)
LH front (with HID headlamps) C156-3	C2280a-21	CLS21 (BU/GN)
RH front (with HID headlamps) C166-3	C2280a-9	CLS25 (YE/VT)
LH rear (Milan, Zephyr) C413-3	C2280e-11	CLS18 (GY/BN)
RH rear (Milan, Zephyr) C416-3	C2280e-7	CLS19 (VT/OG)

Is the resistance less than 5 ohms between the inoperative turn lamp and the SJB, and greater than 10,000 ohms between the inoperative turn lamp and ground?

Yes : GO to N5.

No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test

N4 CHECK THE TURN LAMP VOLTAGE SUPPLY CIRCUITRY FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: SJB C2280e (Rear Lamp) or C2280a (Front Lamp).
- Key in ON position.
- Does the turn lamp in question continue to illuminate?
Yes : For the LH front turn lamp, REPAIR circuit CLS21 (BU/GN). CLEAR the DTCs. REPEAT the self-test.

For the RH front turn lamp, REPAIR circuit CLS25 (YE/VT). CLEAR the DTCs. REPEAT the self-test.

For the LH rear turn lamp, REPAIR circuit CLS18 (GY/BN). CLEAR the DTCs. REPEAT the self-test.

For the RH rear turn lamp, REPAIR circuit CLS19 (VT/OG). CLEAR the DTCs. REPEAT the self-test.

No : GO to N5.
N5 CHECK FOR CORRECT SJB OPERATION
- Key in OFF position.
- Disconnect all the SJB connectors.
- Check for:
  - Corrosion
  - Pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.