Audio Unit C290b

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Audio Unit C290B Connector Pinouts

Courtesy of FORD MOTOR CO.

AUDIO UNIT C290B CONNECTOR PINOUTS REFERENCE

Pin Number(s)	Circuit Designation/Description	Normal Condition/Measurement
1	29-MD15 (OG/BK) B+ battery feed, audio unit memory (CDX6)	Greater than 10 volts between the audio unit and ground.
1	29-MD15 (OG/YE) B+ battery feed, audio unit memory (DM1 00i)	Greater than 10 volts between the audio unit and ground.
2	75-MD15 (YE/GN) B+ battery feed with the ignition in the ON and ACCESSORY positions	Greater than 10 volts between the audio unit and ground with the ignition in the ON or ACCESSORY positions.
8	8-MD10 (WH/BK) LF speaker output	Less than 5 ohms between the audio unit and the speaker and greater than 10,000 ohms between the audio unit and ground.
9	8-MD11 (WH/VT) LR speaker output	Less than 5 ohms between the audio unit and the speaker and greater than 10,000 ohms between the audio unit and ground.
10	8-MD18 (WH) RR speaker output	Less than 5 ohms between the audio unit and the speaker and greater than 10,000 ohms between the audio unit and ground.
11	8-MD17 (WH/RD) RF speaker output	Less than 5 ohms between the audio unit and the speaker and greater than 10,000 ohms between the audio unit and ground.
12	10-MD17 (GY/RD) RF speaker return	Less than 5 ohms between the audio unit and the speaker and greater than 10,000 ohms between the audio unit and ground.
13 (DM10I)	31-MD15(BK/GN) audio unit ground	Less than 5 ohms between the audio unit and ground.
13 (CDX6)	31-MD15A (BK/GN) audio unit ground	Less than 5 ohms between the audio unit and ground.
15	50-MD15 (GY/OG) B+ power feed START position only	Greater than 10 volts with ignition in START position.
18	8-MD26 (WH/BK) steering wheel audio controls reference signal	Less than 5 ohms between the audio unit and the steering wheel control switch. Greater than 10,000 ohms between the audio unit and ground.
19	31S-MD26 (BK/RD) steering wheel audio controls reference signal	Less than 5 ohms between the audio unit and the steering wheel control switch. Greater than 10,000 ohms between the audio unit and ground.
21	10-MD10 (GY/BK) LF speaker return	Less than 5 ohms between the audio unit and the speaker and greater than 10,000 ohms between the audio unit and ground.
22	10-MD11 (GY/WH) LR speaker return	Less than 5 ohms between the audio unit and the speaker and greater than 10,000 ohms between the audio unit and ground.
23	10-MD18 (GY) RR speaker return	Less than 5 ohms between the audio unit and the speaker and greater than 10,000 ohms between the audio unit and ground.