Pinpoint Test N: One Turn Signal/Hazard Lamp Is Inoperative/Always On
Turn Signal and Hazard Lamps
Pinpoint Tests
Pinpoint Test N: One Turn Signal/Hazard Lamp Is Inoperative/Always On
Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number
Normal Operation
When the Smart Junction Box (SJB) detects the multifunction switch in the LH TURN position, the SJB provides on/off voltage through circuit CLS21 (BU/GN) to the LH front turn lamp. For Sable, the SJB also provides on/off voltage to the LH rear lamp through circuit CLS23 (GY/OG).
When the SJB detects the multifunction switch in the RH TURN position, the SJB provides on/off voltage through circuit CLS25 (YE/VT) to the RH front turn lamp. For Sable, the SJB also provides on/off voltage to the RH rear lamp through circuit CLS24 (BN/WH).
For Taurus and Taurus X, the rear turn lamps are controlled utilizing the rear stoplamp circuitry.
Circuits GD123 (BK/GY) and GD120 (BK/GN) provide ground for the LH and RH front turn lamps, respectively. For Sable, the LH and RH rear turn lamps share the ground circuit with the stoplamps.
B2A2A-B2051:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Bulb holder
- Rear lamp jumper harness
- SJB
PINPOINT TEST N: ONE TURN SIGNAL/HAZARD LAMP IS INOPERATIVE/ALWAYS ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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N1 CHECK THE STOPLAMPS
- Apply and release the brake pedal while observing the stoplamps.
- Do the stoplamps operate correctly?
Yes
GO to N2.
No
REFER to Stoplamps Testing and Inspection.
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N2 DETERMINE IF A TURN LAMP IS ALWAYS ON
- Ignition ON.
- Observe the turn lamps.
- Is any turn lamp always on?
Yes
GO to N3.
No
GO to N4.
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N3 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c (Rear Turn Lamp).
- Ignition ON.
- 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 CLS23 (GY/OG). CLEAR the DTCs. REPEAT the self-test.
For the RH rear turn lamp, REPAIR circuit CLS24 (BN/WH). CLEAR the DTCs. REPEAT the self-test.
No
GO to N10.
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N4 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Check the recorded results from the SJB on-demand self-test.
- Is DTC B2048, B2050, B2A28 or B2A2A present?
Yes
GO to N5.
No
GO to N7.
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N5 CHECK THE REAR LAMP JUMPER HARNESS OR THE FRONT BULB HOLDER FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Repeat the SJB on-demand self-test.
- Is on-demand DTC B2048, B2050, B2A28 or B2A2A retrieved again?
Yes
GO to N6.
No
For a rear lamp, REPAIR or INSTALL a new rear lamp jumper harness. CLEAR the DTCs. REPEAT the self-test.
For a front lamp, INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test.
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N6 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: C2280f (Front Turn Lamp).
- Disconnect: C2280c (Rear Turn Lamp).
- Measure the resistance between the SJB, harness side and ground as follows:
B2A2A-B2050:
- Is the resistance greater than 10,000 ohms?
Yes
GO to N10.
No
REPAIR the circuit in question for a short to ground. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
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N7 CHECK FOR VOLTAGE TO THE INOPERATIVE TURN LAMP
- Ignition OFF.
- Disconnect: Inoperative Turn Lamp.
- Turn the hazard lamps on.
- For Taurus or Taurus X, measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and ground.
- For Sable front turn lamp, measure the voltage between the LH front turn lamp C1115-3, circuit CLS21 (BU/GN), harness side and ground; or between the RH front turn lamp C1116-3, circuit CLS25 (YE/VT), harness side and ground.
- For Sable rear turn lamp, measure the voltage between the LH rear lamp C414-2, circuit CLS23 (GY/OG), harness side and ground; or between the RH front turn lamp C417-2, circuit CLS24 (BN/WH), harness side and ground.
- Does the voltage fluctuate between 0 and greater than 10 volts?
Yes
GO to N8.
No
GO to N9.
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N8 CHECK THE GROUND CIRCUIT FOR AN OPEN
- Disconnect: Negative Battery Cable.
- For Taurus or Taurus X, measure the resistance between the LH front turn lamp C1023-1, circuit GD123 (BK/GY), harness side and ground; or between the RH front turn lamp C1043-1, circuit GD120 (BK/GN), harness side and ground.
- For Sable, measure the resistance between the LH front turn lamp C1115-1, circuit GD123 (BK/GY), harness side and ground; or between the RH front turn lamp C1116-1, circuit GD120 (BK/GN), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
For a front turn lamp, INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test.
For a rear turn lamp, REPAIR or INSTALL a new rear lamp jumper harness. CLEAR the DTCs. REPEAT the self-test.
No
REPAIR the ground circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.
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N9 CHECK TURN LAMP OUTPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280f (Front Turn Lamp).
- Disconnect: SJB C2280c (Rear Turn Lamp).
- Measure the resistance between the inoperative turn lamp, harness side and the SJB, harness side as follows:
- Is the resistance less than 5 ohms?
Yes
GO to N10.
No
REPAIR the circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.
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N10 CHECK FOR CORRECT SJB OPERATION
- Ignition OFF.
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- 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. 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.
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