Audio Unit C240a

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

AUDIO UNIT C240a


Pin Number(s)	Circuit Designation/Description	Normal Condition/Measurement
1	797 (LG/VT) B+ battery feed at all times	Greater than 10 volts between the audio unit and ground.
2	687 (GY/YE) B+ battery feed with the key in the ON and ACC positions	Greater than 10 volts between the audio unit and ground with the key in the ON or ACC positions.
8	804 (OG/LG) 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 (except base audio)	800 (GY/LB) 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.
9(base audio)	1726 (GY/LB) 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 (except base audio)	802 (OG/RD) 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.
10 (base audio)	1781 (OG/RD) 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	805 (WH/LG) 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	811 (DG/OG) 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	694 (BK/LG) audio unit ground	Less than 5 ohms between the audio unit and ground.
15	1000 (RD/BK) B+ power feed START position only	Greater than 10 volts with key in START position.
18	595 (LB/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	813 (LB/WH) 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 (except base audio)	801 (TN/YE) 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.
22 (base audio)	1725 (TN/YE) 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 (except base audio)	803 (BN/PK) 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.
23 (base audio)	1780 (BN/PK) 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.