Pinpoint Test H: One Or More Stoplamps Are Inoperative
Stoplamps
Pinpoint Tests
Pinpoint Test H: 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
Voltage is supplied from the Bussed Electrical Center (BEC) to the Smart Junction Box (SJB) through circuits 1523 (DG), 905 (GY/LB), and 1052 (TN/BK) to power the LH and RH stoplamps, and the high mounted stoplamp.
The stoplamp switch is provided voltage through circuit 10 (LG/RD). When the brake pedal is applied, the stoplamp switch routes voltage to the SJB through circuit 511 (LG). The SJB then provides voltage to the stoplamps through circuits 1783 (RD/WH), 1374 (TN/LB), 1728 (LB/OG), and 1363 (WH/RD). Ground for the stoplamps is provided through circuit 1205 (BK).
B2044-B2534:
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Stoplamp switch
- BEC
- SJB
PINPOINT TEST H: 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: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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H1 DETERMINE IF ALL THE STOPLAMPS ARE INOPERATIVE
- Ignition OFF.
- Apply the brake pedal and observe the rear lamps.
- Are all the stoplamps inoperative?
Yes
GO to H2.
No
GO to H8.
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H2 CHECK CIRCUIT 1523 (DG) FOR VOLTAGE
- Disconnect: SJB C2280h.
- Measure the voltage between the SJB C2280h-11, circuit 1523 (DG), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to H4.
No
VERIFY the BEC fuse 63 (30A) is OK. If OK, GO to H3. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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H3 CHECK CIRCUIT 1523 (DG) FOR AN OPEN
- Disconnect: BEC C1035a.
- Measure the resistance between the SJB C2280h-11, circuit 1523 (DG), harness side and BEC C1035a-C5, circuit 1523 (DG), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new BEC. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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H4 CHECK CIRCUIT 10 (LG/RD) FOR VOLTAGE
- Connect: SJB C2280h.
- Disconnect: Stoplamp Switch C2314.
- Measure the voltage between the stoplamp switch C2314-1, circuit 10 (LG/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to H6.
No
VERIFY the SJB fuse 15 (10A) is OK. If OK, GO to H5. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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H5 CHECK CIRCUIT 10 (LG/RD) FOR AN OPEN
- Disconnect: SJB C2280h.
- Measure the resistance between the stoplamp switch C2314-1, circuit 10 (LG/RD), harness side and the SJB C2280h-10, circuit 10 (LG/RD), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to H13.
No
REPAIR the circuit. TEST the system for normal operation.
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H6 BYPASS THE STOPLAMP SWITCH
- Connect a fused jumper wire between the stoplamp switch C2314-1, circuit 10 (LG/RD), harness side and the stoplamp switch C2314-2, circuit 511 (LG), harness side.
- Do the stoplamps illuminate?
Yes
REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to Stoplamp Switch Service and Repair. TEST the system for normal operation.
No
REMOVE the jumper wire. GO to H7.
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H7 CHECK CIRCUIT 511 (LG) FOR AN OPEN
- Disconnect: SJB C2280h.
- Measure the resistance between the stoplamp switch C2314-2, circuit 511 (LG), harness side and the SJB C2280h-16, circuit 511 (LG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to H13.
No
REPAIR the circuit. TEST the system for normal operation.
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H8 CHECK THE VOLTAGE TO THE SJB
- Ignition OFF.
- Disconnect: SJB C2280h.
- Measure the voltage between the SJB, harness side and ground as follows:
- Are the voltages greater than 10 volts?
Yes
GO to H10.
No
VERIFY the BEC fuses 59 (30A) and 67 (30A) are OK. If OK, GO to H9. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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H9 CHECK THE VOLTAGE SUPPLY CIRCUITS TO THE SJB FOR AN OPEN
- Disconnect: BEC C1035a.
- Measure the resistance between the SJB, harness side and the BEC, harness side as follows:
- Are the resistances less than 5 ohms?
Yes
INSTALL a new BEC. CLEAR the DTCs. REPEAT the self-test.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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H10 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Disconnect: Inoperative Stoplamp.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the inoperative stoplamp, harness side and ground as follows:
- Is the resistance less than 5 ohms?
Yes
GO to H11.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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H11 CHECK THE STOPLAMP VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND
- Disconnect: SJB C2280d.
- Measure the resistance between the inoperative stoplamp, harness side and ground as follows:
- Is the resistance greater than 10,000 ohms?
Yes
GO to H12.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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H12 CHECK THE STOPLAMP VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Measure the resistance between the inoperative stoplamp, harness side and the SJB, harness side as follows:
- Is the resistance less than 5 ohms?
Yes
GO to H13.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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H13 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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