Pinpoint Test J: One Or More Stoplamps Are Inoperative
Stoplamps
Pinpoint Tests
Pinpoint Test J: One Or More Stoplamps Are Inoperative
Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number
Normal Operation - Taurus, Taurus X
The stoplamp switch is supplied voltage through circuit SBP02 (YE/RD) from the Smart Junction Box (SJB). When the brake pedal is applied, the stoplamp switch routes voltage to the SJB and the high mounted stoplamp through circuit CCB08 (VT/WH). The SJB then provides voltage to the LH and RH rear lamps through circuits CLS18 (GY/BN) and CLS19 (VT/OG), respectively.
Ground for the high mounted stoplamp and the LH rear lamp is provided through circuit GD147 (BK/VT). Ground for the RH rear lamp is provided through circuit GD148 (BK/YE).
Sable
The stoplamp switch is supplied voltage through circuit SBP02 (YE/RD) from the SJB. When the brake pedal is applied, the stoplamp switch routes voltage to the rear lamps and the high mounted stoplamp through circuit CCB08 (VT/WH).
Ground for the high mounted stoplamp and the LH rear lamp is provided through circuit GD147 (BK/VT). Ground for the RH rear lamp is provided through circuit GD148 (BK/YE).
NOTE: On the Taurus X, DTCs B2045 and B2047 set even when the rear lamp operates correctly. The LED rear lamp does not draw enough current and the SJB faults this as an open condition. A visual inspection is required to make sure the lamp is operating correctly.
B2044-B2047:
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Rear lamp assembly
- Rear lamp jumper harness
- High mounted stoplamp
- SJB
PINPOINT TEST J: ONE OR MORE STOPLAMPS ARE INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Make sure the bulb is good before continuing diagnostics.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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J1 DETERMINE THE INOPERATIVE STOPLAMP
- Ignition OFF.
- Apply the brake pedal and observe the stoplamps.
- Are all the stoplamps inoperative?
Yes
Go To Pinpoint Test I. Pinpoint Test I: All The Stoplamps Are Inoperative
No
For the high mounted stoplamp, GO to J2.
For Taurus or Taurus X, if both sides (LH and RH rear stoplamps) are inoperative, VERIFY the SJB fuse 6 (20A) is OK. If OK, GO to J4. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
For Taurus or Taurus X, if only one side (the LH or RH rear stoplamp) is inoperative, GO to J5.
For Sable, GO to J12.
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J2 CHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP
- Disconnect: High Mounted Stoplamp.
- While applying the brake pedal, measure the voltage between the high mounted stoplamp, harness side and ground as follows:
- Is the voltage greater than 10 volts?
Yes
GO to J3
No
REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.
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J3 CHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP USING THE CONNECTOR GROUND
- While applying the brake pedal, measure the voltage between the high mounted stoplamp, harness side and ground as follows:
- Is the voltage greater than 10 volts?
Yes
INSTALL a new high mounted stoplamp. REFER to High Mounted Stoplamp Service and Repair. TEST the system for normal operation.
No
REPAIR circuit GD147 (BK/VT) for an open. TEST the system for normal operation.
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J4 CHECK FOR VOLTAGE TO THE SJB
- Disconnect: SJB C2280b.
- While applying the brake pedal, measure the voltage between the SJB C2280b-40, circuit CCB08 (VT/WH), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to J15.
No
REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.
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J5 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
NOTE: On the Taurus X, DTCs B2045 (LH rear lamp) and B2047 (RH rear lamp) set even when the rear lamps operate correctly. A visual inspection is required to make sure the lamp(s) are operating correctly before continuing diagnostics.
- Check the recorded results from the SJB on-demand self-test.
- Is DTC B2044 or DTC B2046 present?
Yes
GO to J6.
No
GO to J8.
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J6 CHECK THE REAR LAMP JUMPER HARNESS FOR A SHORT TO GROUND
- Disconnect: Inoperative Stoplamp.
- 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 B2044 or B2046 retrieved again?
Yes
GO to J7.
No
REPAIR or INSTALL a new rear lamp jumper harness. CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
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J7 CHECK THE SJB STOPLAMP OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280d.
- Measure the resistance between the SJB C2280d-25 (LH stoplamp), circuit CLS18 (GY/BN), harness side and ground; or between the SJB C2280d-26 (RH stoplamp), circuit CLS19 (VT/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to J15.
No
REPAIR circuit CLS18 (GY/BN) (LH rear stoplamp) or circuit CLS19 (VT/OG) (RH rear stoplamp) 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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J8 CHECK FOR VOLTAGE TO THE REAR LAMP (TAURUS, TAURUS X)
- Disconnect: Inoperative Rear Lamp.
- For Taurus, while applying the brake pedal, measure the voltage between the LH rear lamp C414-5, circuit CLS18 (GY/BN), harness side and ground; or between the RH rear lamp C417-5, circuit CLS19 (VT/OG), harness side and ground.
- For Taurus X, while applying the brake pedal, measure the voltage between the LH rear lamp C498-2, circuit CLS18 (GY/BN), harness side and ground; or between the RH rear lamp C499-2, circuit CLS19 (VT/OG), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to J9.
No
GO to J11.
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J9 CHECK THE REAR LAMP GROUND CIRCUIT FOR AN OPEN (TAURUS, TAURUS X)
- Disconnect: Negative Battery Cable.
- For Taurus, measure the resistance between the LH rear lamp C414-6, circuit GD147 (BK/VT), harness side and ground; or between the RH rear lamp C417-6, circuit GD148 (BK/YE), harness side and ground.
- For Taurus X, measure the resistance between the LH rear lamp C498-8, circuit GD147 (BK/VT), harness side and ground; or between the RH rear lamp C499-8, circuit GD148 (BK/YE), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
For Taurus, REPAIR or INSTALL a new rear lamp jumper harness. CLEAR the DTCs. REPEAT the self-test.
For Taurus X, GO to J10.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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J10 CHECK THE REAR LAMP JUMPER HARNESS FOR AN OPEN (TAURUS X)
- Inspect the rear lamp jumper harness for opens.
- Is the rear lamp jumper harness OK?
Yes
INSTALL a new LED module. TEST the system for normal operation.
No
REPAIR or INSTALL a new rear lamp jumper harness. TEST the system for normal operation.
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J11 CHECK THE SJB STOPLAMP OUTPUT CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280d.
- For Taurus, measure the resistance between the LH rear lamp C414-5, circuit CLS18 (GY/BN), harness side and the SJB C2280d-25, circuit CLS18 (GY/BN), harness side; or between the RH rear lamp C417-5, circuit CLS19 (VT/OG), harness side and the SJB C2280d-26, circuit CLS19 (VT/OG), harness side.
- For Taurus X, measure the resistance between the LH rear lamp C498-2, circuit CLS18 (GY/BN), harness side and the SJB C2280d-25, circuit CLS18 (GY/BN), harness side; or between the RH rear lamp C499-2, circuit CLS19 (VT/OG), harness side and the SJB C2280d-26, circuit CLS19 (VT/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J15.
No
REPAIR circuit CLS18 (GY/BN) (LH rear stoplamp) or circuit CLS19 (VT/OG) (RH rear stoplamp) for an open. CLEAR the DTCs. REPEAT the self-test.
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J12 CHECK FOR VOLTAGE TO THE REAR LAMP (SABLE)
- Disconnect: Inoperative Rear Lamp.
- While applying the brake pedal, measure the voltage between the LH rear lamp C414-3, circuit CCB08 (VT/WH), harness side and ground; or between the RH rear lamp C417-3, circuit CCB08 (VT/WH), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to J13.
No
REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.
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J13 CHECK THE REAR LAMP GROUND CIRCUIT FOR AN OPEN (SABLE)
- Disconnect: Negative Battery Cable.
- Measure the resistance between the LH rear lamp C414-6, circuit GD147 (BK/VT), harness side and ground; or between the RH rear lamp C417-6, circuit GD148 (BK/YE), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to J14.
No
REPAIR the ground circuit in question for an open. TEST the system for normal operation.
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J14 CHECK THE REAR LAMP JUMPER HARNESS FOR AN OPEN (SABLE)
- Inspect the rear lamp jumper harness for opens.
- Is the rear lamp jumper harness OK?
Yes
INSTALL a new LED module. TEST the system for normal operation.
No
REPAIR or INSTALL a new rear lamp jumper harness. TEST the system for normal operation.
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J15 CHECK FOR CORRECT SJB OPERATION
- 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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