Pinpoint Test K: All The Stoplamps Are Inoperative

Stoplamps

Pinpoint Test K: All The Stoplamps Are Inoperative

Refer to Wiring Diagram Set 11, Fuse and Relay Information for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. Diagrams By Number

Normal Operation

The stoplamp switch is supplied voltage from the Smart Junction Box (SJB).

When the brake pedal is applied on vehicles without adaptive cruise control, the voltage is supplied directly to the stoplamps.

When the brake pedal is applied on vehicles with adaptive cruise control, the voltage is routed to the adaptive cruise control stoplamp relay (located in the Battery Junction Box (BJB)). The voltage passes through the relay which is then routed to the stoplamps.

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- Adaptive cruise control stoplamp relay

- Stoplamp switch

- SJB (Smart Junction Box)

PINPOINT TEST K : ALL THE 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.

K1 CHECK FOR VOLTAGE TO THE STOPLAMP SWITCH

- Ignition OFF.

- Disconnect: Stoplamp Switch C278.

- Measure the voltage between the stoplamp switch C278-4, circuit SBP02 (YE/RD), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to K3.

No
VERIFY the SJB (Smart Junction Box) fuse 2 (15A) is OK. If OK, GO to K2. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number

K2 CHECK THE STOPLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

- Disconnect: SJB (Smart Junction Box) C2280D.

- Measure the resistance between the stoplamp switch C278-4, circuit SBP02 (YE/RD), harness side and the SJB (Smart Junction Box) C2280D-13, circuit SBP02 (YE/RD), harness side.





Is the resistance less than 5 ohms?

Yes
GO to K6.

No
REPAIR circuit SBP02 (YE/RD) for an open. TEST the system for normal operation.

K3 BYPASS THE STOPLAMP SWITCH

- Connect a fused jumper wire between the stoplamp switch C278-4, circuit SBP02 (YE/RD), harness side and the stoplamp switch C278-1, circuit CCB08 (VT/WH) (vehicles without adaptive cruise control) or circuit CLS43 (YE/GN) (vehicles with adaptive cruise control), harness side.





Are the stoplamps illuminated?

Yes
REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to Stoplamp Switch . TEST the system for normal operation.

No
For vehicles without adaptive cruise control, REMOVE the jumper wire. REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.

For vehicles with adaptive cruise control, LEAVE the jumper wire connected. GO to K4.

K4 CHECK THE STOPLAMP SWITCH OUTPUT CIRCUIT FOR AN OPEN (TO THE ADAPTIVE CRUISE CONTROL STOPLAMP RELAY)

- Disconnect: Adaptive Cruise Control Stoplamp Relay.

- Measure the voltage between the adaptive cruise control stoplamp relay pin 4, circuit CLS43 (YE/GN), BJB (Battery Junction Box) face side and ground.





Is the voltage greater than 10 volts?

Yes
GO to K5.

No
REMOVE the jumper wire. REPAIR circuit CLS43 (YE/GN) for an open. TEST the system for normal operation.

K5 BYPASS THE ADAPTIVE CRUISE CONTROL STOPLAMP RELAY

- Connect a fused jumper wire between the adaptive cruise control stoplamp relay pin 4, circuit CLS43 (YE/GN), BJB (Battery Junction Box) face side and the adaptive cruise control stoplamp relay pin 3, circuit CCB08 (VT/WH), BJB (Battery Junction Box) face side.





Are the stoplamps illuminated?

Yes
REMOVE the jumper wires. INSTALL a new adaptive cruise control stoplamp relay. TEST the system for normal operation.

No
REMOVE the jumper wires. REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.

K6 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) 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 (Smart Junction Box). 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.