What wire carries 12V in REVERSE to the backup lamps?

Circuit 140, BK/PK (black/pink), leaves the Transmission Range (TR) sensor with 12V when the transmission is in REVERSE.

How do the backup lamps get power?

With the transmission in REVERSE, the manual lever position (Transmission Range) sensor directs current to illuminate the backup lamps.

Which circuit is used only with the 4R70W transmission?

Circuit 359 GY/R through connector C1012 is marked * 4R70W ONLY.

Where can I find TR sensor switch testing procedures?

The diagram directs you to page 149-10 for Transmission Range (TR) sensor switch testing.

What circuit connects the TR sensor to the starting system?

Circuit 32 R/LB (red/light blue): it carries 12V in START into the sensor and 12V in P or N back to the Starting System (pages 20-2, 20-4).

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1996 Ford Bronco Backup Lamps Wiring Diagram 93-2 - TR Sensor E4OD/4R70W

Ford EVTM page 93-2: backup lamps wiring diagram with transmission range sensor

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Backup lamp wiring diagram showing the E4OD transmission range sensor and starting/all-wheel-drive circuit connections.

AI caption July 2018 · Photo 324 of 386

This document is page 93-2, "Backup Lamps," from a Ford electrical/vacuum troubleshooting manual (EVTM) wiring diagram set. It shows the backup lamp circuit routing through the Transmission Range (TR) sensor used with 4R70W or E4OD automatic transmissions. A callout explains that with the transmission in REVERSE, the manual lever position sensor directs current to illuminate the backup lamps. Inputs to the TR sensor include circuit 32 (R/LB, 12V in START) from the Starting System (pages 20-2, 20-4), circuit 57 (BK) from All-Wheel Drive (page 34-1), circuit 298 (P/O, 12V in RUN) from the E4OD Transmission (pages 30-1, 30-4) or 4R70W Transmission (page 29-4), and circuit 359 (GY/R) via connector C1012 (4R70W only). Outputs include circuit 32 (R/LB, 12V in P or N) back to the Starting System, circuit 463 (R/W) to All-Wheel Drive, circuit 140 (BK/PK, 12V in REVERSE) feeding the backup lamps, and circuit 199 (LB/Y) via C1012 to the transmission pages. The reader learns wire colors, circuit numbers, connector C1012 usage, and that TR sensor switch testing procedures are on page 149-10.

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Frequently asked questions

What wire carries 12V in REVERSE to the backup lamps?: Circuit 140, BK/PK (black/pink), leaves the Transmission Range (TR) sensor with 12V when the transmission is in REVERSE.
How do the backup lamps get power?: With the transmission in REVERSE, the manual lever position (Transmission Range) sensor directs current to illuminate the backup lamps.
Which circuit is used only with the 4R70W transmission?: Circuit 359 GY/R through connector C1012 is marked * 4R70W ONLY.
Where can I find TR sensor switch testing procedures?: The diagram directs you to page 149-10 for Transmission Range (TR) sensor switch testing.
What circuit connects the TR sensor to the starting system?: Circuit 32 R/LB (red/light blue): it carries 12V in START into the sensor and 12V in P or N back to the Starting System (pages 20-2, 20-4).