What fuse powers the rear anti-lock brake (RABS) circuit shown in this diagram?

Fuse 18, a 15A fuse in the fuse panel (pages 12-3, 12-5), which is hot in start or run, feeding circuit 640 R/Y.

What is the resistance of the ABS rear axle sensor?

The diagram shows the ABS Rear Axle Sensor as 1400 ohms.

What wire colors connect the rear axle sensor to the RABS module?

Circuit 519 LG/BK (light green/black) and circuit 523 R/PK (red/pink), passing through connectors C414, C133 and splices S150 and S151, plus the RABS Test Connector via C143.

How does the RABS valve assembly get grounded?

Through wire 397 BK/W, passing connectors C158 and C102 to ground G102 (see grounds, page 10-9). The valve assembly contains 1.2-ohm and 4.0-ohm coils and a valve reset switch.

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1990 Ford Bronco Anti-Lock Brakes (RABS) Wiring Diagram - EVTM Page 42-2

Ford Bronco F-Series Rear Anti-Lock Brake (RABS) system wiring diagram, EVTM page 42-2

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Rear Anti-Lock Brake (RABS) wiring schematic showing the 1400-ohm rear axle sensor, RABS module, RABS valve assembly with 1.2 and 4.0 ohm coils, and 4x4 hi/low indicator switch.

AI caption September 2011 · Photo 863 of 1799

This document is page 42-2 of a Ford factory electrical/vacuum troubleshooting manual (EVTM), showing the wiring schematic for the Anti-Lock Brakes system — specifically the Rear Anti-Lock Brake System (RABS). The diagram traces circuits from the ABS Rear Axle Sensor (specified at 1400 ohms) through wires 519 LG/BK and 523 R/PK, including splices S150 and S151 and the RABS Test Connector (referenced to page 34-1), into the solid-state Rear Anti-Lock Brake (RABS) Module (pins 3, 5, 6, 8, 10, 13, 14 shown). Module outputs run via circuits 664 Y/LG, 599 LB/R, and 535 LB/R through connectors C102, C202, C133, and C158 to the RABS Valve Assembly (1.2 ohm and 4.0 ohm coils and a valve reset switch), grounding through wire 397 BK/W to ground G102. Power comes from fuse 18 (15A) in the fuse panel, hot in start or run, via circuit 640 R/Y and splice S216 to the 4x4 Indicator in the instrument panel, then circuit 210 LB through connectors C250, C202, C103, and C117 to the 4x4 Hi/Low Indicator Switch, which is closed in 4-wheel drive. Cross-references point to fuse panel pages 12-3/12-5, charge/power distribution pages 12-7/12-8, grounds page 10-9, and pages 34-1 and 60-4.

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Frequently asked questions

What fuse powers the rear anti-lock brake (RABS) circuit shown in this diagram?: Fuse 18, a 15A fuse in the fuse panel (pages 12-3, 12-5), which is hot in start or run, feeding circuit 640 R/Y.
What is the resistance of the ABS rear axle sensor?: The diagram shows the ABS Rear Axle Sensor as 1400 ohms.
What wire colors connect the rear axle sensor to the RABS module?: Circuit 519 LG/BK (light green/black) and circuit 523 R/PK (red/pink), passing through connectors C414, C133 and splices S150 and S151, plus the RABS Test Connector via C143.
How does the RABS valve assembly get grounded?: Through wire 397 BK/W, passing connectors C158 and C102 to ground G102 (see grounds, page 10-9). The valve assembly contains 1.2-ohm and 4.0-ohm coils and a valve reset switch.
What circuit connects the 4x4 indicator to the 4x4 hi/low indicator switch?: Circuit 210 LB (light blue), running from the 4x4 indicator through connectors C250, C202, C103, and C117 to the 4x4 Hi/Low Indicator Switch, which is closed in 4-wheel drive.