Adaptive Cruise Control (ACC) Unit Inputs and Outputs

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying ACC Unit 20P Connector Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Terminal number	Wire color	Terminal name	Description	Signal
1	WHT	BRAKE DIAG	Detects brake light relay activation	ACC brake operated or brake pedal pressed: battery voltage
2	YEL	+ B TECH (10 A)	Detects ignition switch ON/OFF signals	Ignition switch ON (II): battery voltage Ignition switch OFF: about 0 V
3	GRN	SG	Sensor ground	Less than 0.2 V at all times
5	ORN	VCC	Provides sensor voltage	Ignition switch ON (II): about 5 V Ignition switch OFF: about 0 V
6	BLK	PRESS FR	Detects the brake fluid pressure signal of the right front brake caliper	Ignition switch ON (II): about 0.5-4.5 V Ignition switch OFF: about 0 V
7	PUR	F-CAN B H	F-CAN communication B (high) circuit	--
8	ORN	K-LINE	Sends and receives scan tool signals	--
9	BLK	GND	Ground circuit for the ACC system	--
10	WHT	F-CAN A H	F-CAN communication A (high) circuit	--
11	BLK	GND	Ground circuit for the ACC system	Less than 0.2 V at all times
12	BLK	GND	Ground circuit for the ACC system	Less than 0.2 V at all times
13	WHT	+B BACK UP (10 A)	Provides DTC memory voltage	Battery voltage
14	BLU	PRESS FL	Detects the brake fluid pressure signal of the left front brake caliper	Ignition switch ON (II): about 0.5-4.5 V Ignition switch OFF: about 0 V
15	GRY	WEN	Detects the write enable signal	--
16	YEL	BRAKE LAMP	Drives the brake light relay	Ignition switch ON (II): battery voltage Ignition switch OFF: about 0 V
17	RED	M/R TRX	Communicates with the millimeter wave radar	Ignition switch ON (II): battery voltage Ignition switch OFF: about 0 V
18	PNK	F-CAN B L	F-CAN communication B (low) circuit	--
20	RED	F-CAN A L	F-CAN communication A (low) circuit	--