Pinpoint Test A: No Power in All Ignition Switch Positions
Steering Column Switches
Pinpoint Tests
Pinpoint Test A: No Power in All Ignition Switch Positions
Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. Diagrams By Number
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 CDC34 (WH/OG), CDC33 (VT/GN) and CDC32 (BN/YE)
- START - Power on circuits CDC35 (BU/WH)
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Ignition switch
- SJB
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.
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A1 CHECK FOR VOLTAGE AT SJB FUSE 27 (20A)
- Ignition OFF.
- Disconnect: SJB Fuse 27 (20A).
- Measure the voltage between SJB fuse 27, input side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to A2.
No
INSTALL a new SJB. TEST the system for normal operation.
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A2 CHECK THE IGNITION SWITCH FOR VOLTAGE
- Connect: SJB Fuse 27 (20A).
- Disconnect: Ignition Switch C250.
- Measure the voltage between ground and:
- ignition switch C250-8, circuit SBP27 (BU/RD), harness side.
- ignition switch C250-9, circuit SBP27 (BU/RD), harness side.
- Are the voltages greater than 10 volts?
Yes
INSTALL a new ignition switch. REFER to Ignition Switch Ignition Switch. TEST the system for normal operation.
No
VERIFY SJB 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. TEST the system for normal operation. Diagrams By Number
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