Pinpoint Test A : An Auxiliary Switch Controlled Component Is Inoperative

WARNING: This page is about a different car, the 2017 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

A1 PERFORM INSPECTION AND VERIFICATION
- Perform Inspection and Verification procedure in this article.
Was an obvious cause for an observed or reported concern found?

Yes Correct the cause as necessary.

No GO to A2

A2 CHECK THE AUXILIARY SYSTEM
- Ignition ON.
- Operate all the upfitter accessories.
Are all the upfitter accessories inoperative?

Yes GO to Pinpoint Test B

No GO to A3

A3 CHECK THE UPFITTER RELAY
- Ignition OFF.
- Substitute suspect upfitter relay with a known good relay.
- Ignition ON.
- Place the upfitter switch in question to the ON position.
Does the upfitter accessory operate?

Yes INSTALL a new upfitter relay.

No REMOVE the known good relay. GO to A4

A4 CHECK UPFITTER RELAY SUPPLY VOLTAGE

For the auxiliary system in question, measure:

NOTE: For relay and pin assignments, Refer to Fuse and Relay Information for schematic and connector information.

Positive Lead	Measurement / Action	Negative Lead
Upfitter Relay Pin 3	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to A5

No	INSTALL a new BJB.

A5 CHECK THE UPFITTER RELAY CONTROL CIRCUIT FOR OPEN

Ignition ON.

Turn the auxiliary switch for the circuit in question ON.

For the auxiliary switch in question, measure:

NOTE: For relay and pin assignments, Refer to Fuse and Relay Information for schematic and connector information.

Positive Lead	Measurement / Action	Negative Lead
Upfitter relay pin 1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to A7

GO to A6

A6 CHECK THE UPFITTER RELAY CONTROL CIRCUIT FOR CONTINUITY

Ignition OFF.

Disconnect Upfitter Switch C9120 .

For the auxiliary switch in question, measure:

NOTE: For relay and pin assignments, Refer to Fuse and Relay Information for schematic and connector information.

Positive Lead	Measurement / Action	Negative Lead
C9120-4 (AUX 1)	Courtesy of FORD MOTOR COMPANY	Upfitter relay 1 pin 1
C9120-6 (AUX 2)	Courtesy of FORD MOTOR COMPANY	Upfitter relay 2 pin 1
C9120-10 (AUX 3)	Courtesy of FORD MOTOR COMPANY	Upfitter relay 3 pin 1
C9120-9 (AUX 4)	Courtesy of FORD MOTOR COMPANY	Upfitter relay 4 pin 1
C9120-8 (AUX 5)	Courtesy of FORD MOTOR COMPANY	Upfitter relay 5 pin 1
C9120-7 (AUX 6)	Courtesy of FORD MOTOR COMPANY	Upfitter relay 6 pin 1

Is the resistance less than 3 ohms?

Yes	INSTALL a new upfitter switch assembly. REFER to: Auxiliary Switches .

No	REPAIR the circuit.

A7 CHECK THE UPFITTER RELAY GROUND CIRCUITS

Ignition OFF.

For the auxiliary switch in question, measure:

NOTE: For relay and pin assignments, Refer to Fuse and Relay Information for schematic and connector information.

Positive Lead	Measurement / Action	Negative Lead
Upfitter Relay Pin 2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to A8

No	REPAIR the upfitter relay ground circuit in question for an open.

A8 BYPASS THE UPFITTER RELAY

Ignition OFF.

Disconnect the suspect upfitter relay.

For the auxiliary system in question, connect a fused jumper wire:

NOTE: For relay and pin assignments, Refer to Fuse and Relay Information for schematic and connector information.

Positive Lead	Measurement / Action	Negative Lead
Upfitter Relay Pin 3	Courtesy of FORD MOTOR COMPANY	Upfitter Relay Pin 5

Check for voltage at the upfitter device.

Is the voltage greater than 11 volts?

Yes	REPAIR the upfitter system.

No	REPAIR the upfitter supply circuit in question for an open.