Pinpoint Test A: No Power in All Ignition Switch Positions

Steering Column Switches

Pinpoint Test A: No Power in All Ignition Switch Positions

Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information Electrical Diagrams.

Normal Operation

The ignition switch receives fused battery voltage along circuit SBP27 (BU/RD) from Smart Junction Box (SJB) fuse 27 (20A). The ignition switch then sends that voltage out to various systems depending on ignition switch position. The ignition switch has 4 possible states:

- OFF- No power on any circuits

- ACC- Power on circuit CDC33 (VT/GN)

- RUN- Power on circuits CDC33 (VT/GN) and CDC34 (WH/OG)

- START- Power on circuit CDC34 (WH/OG), CDC35 (BU/WH) and CDC54 (WH/GN) (non-hybrid vehicles)

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- Ignition switch

- SJB (Smart Junction Box)

PINPOINT TEST A : NO POWER IN ALL IGNITION SWITCH POSITIONS

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

A1 CHECK FOR VOLTAGE AT SJB (Smart Junction Box) FUSE 27 (20A)

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) Fuse 27 (20A).

- Measure the voltage between SJB (Smart Junction Box) fuse 27 (20A), input side and ground.





Is the voltage greater than 10 volts?

Yes
GO to A2.

No
INSTALL a new SJB (Smart Junction Box). TEST the system for normal operation.

A2 CHECK FOR VOLTAGE TO THE IGNITION SWITCH

- Connect: SJB (Smart Junction Box) fuse 27 (20A).

- Disconnect: Ignition Switch C250.

- Measure the voltage between ignition switch C250-4, circuit SBP27 (BU/RD), harness side and ground.





Is the voltage greater than 10 volts?

Yes
INSTALL a new ignition switch. REFER to Ignition Switch . TEST the system for normal operation.

No
VERIFY SJB (Smart Junction Box) fuse 27 (20A) is OK. If OK, REPAIR circuit SBP27 (BU/RD). If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short Electrical Diagrams. TEST the system for normal operation.