Which fuses power the PSOM/instrument cluster on a 1994 Bronco/F-Series?

Fuse 8 (15A, hot at all times) supplies battery power via circuit 54 LG/Y, and fuse 18 (10A, hot in run) supplies run power via circuit 296 W/P.

What wire colors connect the vehicle speed sensor to the PSOM?

Circuits 523 R/PK (pin 4), 519 LG/BK (pin 5), and 679 GY/BK (pin 7). On Bronco only, alternates 491 O/LB and 530 LG/Y are used.

How is the PSOM grounded?

Pin 2 goes through connector C252 on circuit 676 BK/W to splice S216, then circuit 570 BK/W to ground G200. See Grounds page 10-10.

What speed signal does the PSOM output?

The module's integrated microprocessor receives an input from the ABS sensor and converts it to a standard 8000 pulses per mile speed signal, provided to the PCM and Speed Control Servo/Amplifier Assembly.

Where is the PSOM programming enable connection?

The Enable PSOM Programming Connector (cell 151-15 E1) connects via C232 on circuit 567 LB/Y through C252 to pin 9 (TEST) of the module.

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1994 Ford Bronco/F-Series Instrument Cluster PSOM Wiring Diagram - EVTM 60-7

1994 Bronco standard instrument cluster PSOM wiring diagram with color-coded circuits

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Wiring diagram for the 1994 Bronco standard instrument cluster Programmable Speedometer/Odometer Module circuit.

AI caption February 2020 · Photo 2998 of 3001

This is page 60-7 from the 1994 Ford Bronco/F-Series Electrical and Vacuum Troubleshooting Manual (EVTM), showing the wiring diagram for the standard instrument cluster's Programmable Speedometer/Odometer Module (PSOM). The PSOM receives battery power from fuse 8 (15A, hot at all times) via circuit 54 LG/Y through splice S214, and run power from fuse 18 (10A, hot in run) via circuit 296 W/P through splice S242. A test input on pin 9 (circuit 567 LB/Y through connector C252) connects to the PSOM programming enable connector via C232. The vehicle speed sensor connects via circuits 523 R/PK, 519 LG/BK, and 679 GY/BK, with Bronco-only alternate circuits 491 O/LB and 530 LG/Y. Ground is through circuit 676 BK/W to splice S216, then 570 BK/W to ground G200. A note explains that the solid-state module's microprocessor converts the ABS sensor input to a standard 8000 pulses-per-mile speed signal fed to the PCM and Speed Control Servo/Amplifier. A connector reference list maps C177 (cell 97), C268 (49), C269 (149), and C1027 (27, 28). Cross-references point to power distribution (pages 13-15, 13-17), fuse panel (13-3, 13-9, 13-13), grounds (10-10), and vehicle speed sensor (64-1, 64-2).

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Frequently asked questions

Which fuses power the PSOM/instrument cluster on a 1994 Bronco/F-Series?: Fuse 8 (15A, hot at all times) supplies battery power via circuit 54 LG/Y, and fuse 18 (10A, hot in run) supplies run power via circuit 296 W/P.
What wire colors connect the vehicle speed sensor to the PSOM?: Circuits 523 R/PK (pin 4), 519 LG/BK (pin 5), and 679 GY/BK (pin 7). On Bronco only, alternates 491 O/LB and 530 LG/Y are used.
How is the PSOM grounded?: Pin 2 goes through connector C252 on circuit 676 BK/W to splice S216, then circuit 570 BK/W to ground G200. See Grounds page 10-10.
What speed signal does the PSOM output?: The module's integrated microprocessor receives an input from the ABS sensor and converts it to a standard 8000 pulses per mile speed signal, provided to the PCM and Speed Control Servo/Amplifier Assembly.
Where is the PSOM programming enable connection?: The Enable PSOM Programming Connector (cell 151-15 E1) connects via C232 on circuit 567 LB/Y through C252 to pin 9 (TEST) of the module.