Pinpoint Test H: All The Demand Lamps Are Inoperative

Interior Lighting

Pinpoint Test H: All The Demand Lamps Are Inoperative

Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) supplies voltage to the demand lamps. The demand lamps are ground through one circuit. The glove compartment lamp (MKZ only) is case grounded.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- SJB (Smart Junction Box)

PINPOINT TEST H : ALL THE DEMAND LAMPS ARE INOPERATIVE

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

H1 CHECK THE OPERATION OF THE INTERIOR COURTESY LAMPS

- Ignition OFF.

- Operate the courtesy lamps by opening the LH front door.

Do the courtesy lamps illuminate?

Yes
GO to H2.

No
GO to Pinpoint Test A. Pinpoint Test A: The Courtesy Lamps Do Not Illuminate With A Door Open

H2 CHECK CIRCUIT CLN09 (YE/GN) FOR AN OPEN

- Disconnect: SJB (Smart Junction Box) C2280D.

- Connect a fused jumper wire between the SJB (Smart Junction Box) C2280D-21, circuit CLN09 (YE/GN), harness side and battery positive.





Do the demand lamps illuminate?

Yes
REMOVE the jumper wire. GO to H3.

No
REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.

H3 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.