Audio System & Video System: Other Dodge Caravan III

CCD BUS

The CCD BUS and the universal data link connector are used for access to the diagnostic capabilities of the radio. Circuits D1 and D2 are used. The D1 circuit is used for CCD (+) and circuit D2 is used for CCD (-).

INTERFERENCE ELIMINATION

Some components used on the vehicles are equipped with a capacitor to suppress radio frequency interference/static. Capacitors are mounted in various locations internal to the generator, instrument cluster and windshield wiper motor. To eliminate radio interference, ground straps are used in different areas of the vehicle. These ground circuits should be securely tightened to assure good metal to metal contact. The ground straps conduct very small high frequency electrical signals to ground and require clean surface contact area. The radio ground is supplied from the instrument panel harness and its attached to the rear of the radio. Some engines have other ground straps to eliminate further radio interference

1. Radio chassis-to-instrument panel structure.
2. Engine-to-dash panel.
3. Engine-to-chassis.
4. A/C "H" valve-to-dash panel.

Radio resistance type spark plug cables in the high tension circuit of the ignition system complete the interference suppression. Faulty or deteriorated spark plug wires should be replaced.

RADIO IGNITION INTERFERENCE

Note. Be sure all ground connections are clean and tight without corrosion.

If receiving ignition/engine interference noise on the radio stations, check and clean all engine and body ground connections. Tighten properly after cleaning. (Scheme 67)- (Scheme 70).

Scheme 67

Scheme 68

Scheme 69

Scheme 70

RADIO ILLUMINATION

When parking lights or the headlights are ON, circuits E2 and E17 are used to power the radio illumination lights. Circuits E2 is controlled by the Body Control Module (BCM). Circuit E17 is controlled by the park light switch.

RADIO MEMORY

Both the base and premium systems use the M1 circuit to maintain radio memory. This circuit is connected to the battery through the Power Distribution Center (PDC), and protected by a 10-amp Ignition Off Draw (IOD) fuse located in cavity No. 10 of the PDC. The M1 circuit is used to supply power to the Body Control Module (BCM), power mirrors, and the power door locks. This fuse is also used in several other circuits. The IOD fuse is removed during vehicle shipping to prevent excessive battery draw.

SPEAKERS (BASE SYSTEMS)

Circuit X53 is the feed to the left instrument panel speaker. Circuit X55 is the return from the speaker to the radio. Circuit X54 is the feed to the right instrument panel speaker. Circuit X56 is the return from the speaker to the radio. Circuit X51 is the feed to the left rear speaker. Circuit X57 is the return from the speaker to the radio. Circuit X52 is the feed to the right rear speaker. Circuit X58 is the return from the speaker to the radio.

INFINITY SPEAKERS (PREMIUM SYSTEMS)

Circuit X13 is the feed for the speaker amplifiers located in the front doors and the rear quarter speakers. Circuit X15 is the ground from the speaker amplifiers to the radio. Circuit X53 is the feed for the left instrument panel speaker and the left front door speaker. Circuit X55 is the return from the speaker to the radio. Circuit X54 is the feed for the right instrument panel speaker and the right front door speaker. Circuit X56 is the return from the speakers to the radio. Circuit X51 is the feed for the left rear pillar and left rear quarter panel speakers. Circuit X57 is the return from the speakers to the radio. Circuit X52 is the feed for the right rear pillar and right rear quarter panel speakers. Circuit X58 is the return from the speakers to the radio.

Scheme 71

RADIO CHOKE (PREMIUM SYSTEMS)

The radio choke is used along with the name brand speaker relay to control the switched battery feed for the amplifiers at the speakers. Power for the choke is supplied on circuit X1 when the contact in the name brand speaker relay are CLOSED. From the choke, circuit X13 connects to the speakers.

NAME BRAND SPEAKER RELAY

The relay is located in the junction block and used along with the radio choke to control the switched battery feed to the amplifiers on the speakers. Power for the coil side of the relay is supplied on circuit X0. This circuit connects from the radio to the coil side of the relay and is HOT when the radio ON only. Ground for the coil side of the relay is supplied on circuit Z1 and terminates at the left side cowl. Power for the contact side of the relay is supplied on circuit X12. This circuit is protected by a 10-amp fuse located in cavity No. 8 of the junction block. Battery voltage for the fuse is supplied on circuit A31. This circuit is HOT when the ignition switch is in the ACCESSORY and RUN position. When the contacts in the relay CLOSE circuit X12 connects to circuit X1. Circuit X1 connects from the relay to the radio choke.

SYSTEM TESTS

SYMPTOM INDEX (1996)

SYMPTOM INDEX (1997)

Radio Failures

If any of the following radio failures exist, exchange the radio.

1. AM/FM Switch Inoperative
2. CD Eject Switch Inoperative (CD equipped Radios only)
3. FF/RW Switch Inoperative
4. PWR Switch Inoperative
5. Scan Switch Inoperative
6. Set Switch Inoperative
7. Tune Switch Inoperative
8. 1-5 Presets Inoperative
9. Balance Joystick Inoperative
10. Equalizer Inoperative
11. Hour/Minute Switches Inoperative
12. Pause/Play Switch Inoperative (CD equipped Radios only)
13. Seek Switch Inoperative
14. Tape Eject Switch Inoperative
15. Volt/Time Switch Inoperative.

System Failures

Note. If any of the following system failures exist, perform the appropriate test.

The following code messages are related to the radio tape player or external CD changer (if equipped) and may appear on the radio faceplate.

SYSTEM FAILURES