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 voltage to the LH front turn lamp and the exterior mirror (if equipped with a turn indicator). When the SJB detects the multifunction switch in the RH TURN position, the SJB provides voltage to the RH front turn lamp and the exterior mirror (if equipped with a turn indicator). The rear turn lamps are controlled utilizing the rear stoplamp circuitry.
B2A2A-B106F:
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Bulb holder
- Auxiliary turn signal lamp
- Exterior mirror
- 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.
-------------------------------------------------
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.
-------------------------------------------------
N2 DETERMINE IF A TURN LAMP IS ALWAYS ON
- Ignition ON.
- Monitor the turn lamps while placing the multifunction switch in the RH TURN and then LH TURN positions.
- Is any turn lamp always on?
Yes
GO to N3.
No
GO to N4.
-------------------------------------------------
N3 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280f.
- Ignition ON.
- Does the turn lamp in question continue to illuminate?
Yes
For the LH turn lamp, REPAIR circuit CLS21 (BU/GN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
For the RH turn lamp, REPAIR circuit CLS25 (YE/VT) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
No
GO to N16.
-------------------------------------------------
N4 CHECK FOR AUXILIARY TURN SIGNALS IN THE OUTSIDE REAR VIEW MIRRORS
- Determine if the vehicle is equipped with turn signals in the outside rear view mirrors.
- Is the vehicle equipped with turn signals in the outside rear view mirrors?
Yes
GO to N5.
No
GO to N9.
-------------------------------------------------
N5 DETERMINE IF THE FRONT AND AUXILIARY TURN SIGNAL ARE BOTH INOPERATIVE
- Activate the hazard lamp function on and observe the auxiliary turn signal and the corresponding front turn lamp.
- Are the auxiliary turn signal and the corresponding front turn lamp both inoperative?
Yes
GO to N9.
No
GO to N6.
-------------------------------------------------
N6 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP OR OUTSIDE REAR VIEW MIRROR
- Turn the hazard lamp function off.
- Disconnect: Inoperative Turn Lamp or Exterior Mirror.
- Activate the hazard flasher lamp function.
- For a front lamp, 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 a auxiliary turn signal, measure the voltage between the LH exterior mirror C521-10, circuit CLS21 (BU/GN), harness side and ground; or between the RH exterior mirror C615-10, circuit CLS25 (YE/VT), harness side and ground.
- Does the voltage alternate from 0 to greater than 10 volts?
Yes
GO to N7.
No
REPAIR circuit CLS21 (BU/GN) (LH turn) or circuit CLS25 (YE/VT) (RH turn) for an open. TEST the system for normal operation.
-------------------------------------------------
N7 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP OR OUTSIDE REAR VIEW MIRROR USING THE CONNECTOR GROUND
- For a front lamp, measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the LH front turn lamp C1023-1, circuit GD123 (BK/GY), harness side; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and the RH front turn lamp C1043-1, circuit GD120 (BK/GN), harness side.
- For an auxiliary turn signal, measure the voltage between the LH exterior mirror C521-10, circuit CLS21 (BU/GN), harness side and the LH exterior mirror C521-8, circuit GD134 (BK/VT), harness side; or between the RH exterior mirror C615-10, circuit CLS25 (YE/VT), harness side and the RH exterior mirror C615-8, circuit GD139 (BK/YE), harness side.
- Does the voltage alternate from 0 volts to greater than 10 volts?
Yes
For a front turn lamp, INSTALL a new bulb holder. TEST the system for normal operation.
For an auxiliary turn signal, GO to N8.
No
REPAIR circuit GD123 (BK/GY) (LH front turn lamp), circuit GD120 (BK/GN) (RH front turn lamp), circuit GD134 (BK/VT) (LH auxiliary turn signal) or circuit GD139 (BK/YE) (RH auxiliary turn signal) for an open. TEST the system for normal operation.
-------------------------------------------------
N8 CHECK THE CIRCUITS TO THE LED ASSEMBLY FOR AN OPEN
- Turn the hazard switch off.
- Disconnect: Suspect LED Turn Lamp.
- Measure the resistance between the suspect exterior mirror pin 10, component side and the LED turn lamp connector pin 1 (GN/WH), harness side; and between the suspect exterior mirror pin 8, component side and the LED turn lamp connector pin 2 (BK), harness side.
- Are the resistances less than 5 ohms?
Yes
INSTALL a new auxiliary turn signal lamp. REFER to Side Lamp Assembly - Outside Rear View Mirror Side Lamp Assembly - Outside Rear View Mirror. TEST the system for normal operation.
No
INSTALL a new exterior mirror. REFER to Mirrors. TEST the system for normal operation.
-------------------------------------------------
N9 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
- Turn the hazard lamp function off.
- Check the recorded results from the SJB self-test.
- Is DTC B2A27 or DTC B2A29 present?
Yes
GO to N10.
No
If equipped with auxiliary turn signals, GO to N13.
If not equipped with auxiliary turn signals, GO to N14.
-------------------------------------------------
N10 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP
- Disconnect: Inoperative Front Turn Lamp.
- Activate the hazard flasher lamp function.
- 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.
- Does the voltage alternate from 0 to greater than 10 volts?
Yes
GO to N12.
No
GO to N11.
-------------------------------------------------
N11 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR AN OPEN
- Turn the hazard lamp function off.
- Disconnect: SJB C2280f.
- Measure the resistance between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the SJB C2280f-21, circuit CLS21 (BU/GN), harness side; or between the RH front turn lamp C1043-3, circuit CLS21 (BU/GN), harness side and the SJB C2280f-23, circuit CLS25 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to N16.
No
REPAIR circuit CLS21 (BU/GN) (LH turn) or circuit CLS25 (YE/VT) (RH turn) for an open. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
N12 CHECK FOR VOLTAGE TO THE FRONT TURN LAMP USING THE CONNECTOR GROUND
- Measure the voltage between the LH front turn lamp C1023-3, circuit CLS21 (BU/GN), harness side and the LH front turn lamp C1023-1, circuit GD123 (BK/GY), harness side; or between the RH front turn lamp C1043-3, circuit CLS25 (YE/VT), harness side and the RH front turn lamp C1043-1, circuit GD120 (BK/GN), harness side.
- Does the voltage alternate from 0 volts to greater than 10 volts?
Yes
INSTALL a new bulb holder. CLEAR the DTCs. REPEAT the self-test.
No
REPAIR circuit GD123 (BK/GY) (LH front turn lamp) or circuit GD120 (BK/GN) (RH front turn lamp) for an open. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
N13 ISOLATE THE EXTERIOR MIRROR AS THE CAUSE OF SHORT TO GROUND
- Ignition OFF.
- Disconnect: Suspect Exterior Mirror.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Clear the DTCs and repeat the self-test (required to enable the turn lamp output driver if DTC B106E is present).
- Activate the hazard flasher lamp function.
- Does the inoperative front turn lamp now flash on and off?
Yes
INSTALL a new exterior mirror in question. REFER to Mirrors. TEST the system for normal operation.
No
GO to N14.
-------------------------------------------------
N14 ISOLATE THE BULB HOLDER AS THE CAUSE OF SHORT TO GROUND
- Turn the hazard lamp function off.
- Ignition OFF.
- Disconnect: Inoperative Front Turn Lamp.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB Self-Test.
- Clear the DTCs and repeat the self-test (required to enable the turn lamp output driver if DTC B106E is present).
- Activate the hazard flasher lamp function.
- 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.
- Does the voltage alternate from 0 to greater than 10 volts?
Yes
INSTALL a new bulb holder in question. TEST the system for normal operation.
No
GO to N15.
-------------------------------------------------
N15 CHECK THE SJB TURN LAMP OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Turn the hazard lamp function off.
- Ignition OFF.
- Disconnect: SJB C2280f.
- Measure the resistance between the SJB C2280f-21 (LH turn lamp), circuit CLS21 (BU/GN), harness side and ground; or between the SJB C2280f-23 (RH turn lamp), circuit CLS25 (YE/VT), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to N16.
No
REPAIR circuit CLS21 (BU/GN) (LH turn lamp) or circuit CLS25 (YE/VT) (RH turn lamp) for a short to ground. After the repair:
If no DTCs are present, TEST the system for normal operation.
If DTC B106E is present, CLEAR the DTCs and REPEAT the self-test (required to enable the turn lamp output driver if DTC B106E is present). TEST the system for normal operation.
If DTC B106F is present, INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.
-------------------------------------------------
N16 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. REFER to Body Control Systems. 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.
-------------------------------------------------