Sound System Check Chart

OPERATION (1) EXPECTED RESULT (2) DIAG. ACTION (3)

1. With IGN Switch off, a. Time display appears a. Check ARC Radio fuse press RCL control on momentarily. (YEL/20;CC).
radio b. Check ORN (340) wire.

2. Turn IGN switch to a. Time display appears. a. Check Radio fuse
RUN OR ACCY. (RED/10).
b. Check YEL (43) wire to splice S239 and Radio fuse (RED/10).

3. With IGN switch in a. Power Antenna a. See 8A-151; Power
RUN or ACCY, turn extends. Antenna.
radio on and tune in b. Program is heard b. See "Speaker Test";
a local station. from all speakers. System Check #2.
Center balance and c. See "Antenna Test";
fade controls. System Check #3.

4. With IGN switch a. Radio responds to a. If all controls do in RUN or ACCY, all controls. not work properly, operate all send radio to an AC-Delco
controls at radio. Repair Station.

5. With IGN switch a. Radio digital a. Check BRN (9) wire in RUN or ACCY and display dims. for voltage to ground.
radio on, turn on If wire is good, send
headlights or park- radio to an AC-Delco Repair
ing lights. Set Station.
I/P lights to b. Radio panel lamp b. Check tail lamp fuse
maximum brightness. lights. (YEL/20). Check I/P
lamps fuse (TAN/5) if control head illumination is also out. Check GRY
(8) wire. Check LT. BLU/BLK (151) ground wire.
c. Control head c. Check I/P lamps fuse illumination lights (TAN/5) if radio panel
evenly. light is also out. Check
control head illumination bulbs. If bulbs are good but not lighting, perform "Control Head Power Supply Test".

6. With engine running a. Control head a. Perform "Control Head and headlights or illumination remains Power Supply Test".
parking lights on, lit, with no flickering
turn steering wheel as wheel is turned.
slowly from lock to lock.

7. With engine a. Radio responds to a. If the tuning controls running, headlights or tuning controls operate at some steering
parking lights on and smoothly with no wheel positions, but
radio on, operate the interruptions as not all, perform "Control
TUNE:UP and TUNE:DOWN the steering wheel is Head Power Supply Test"
controls while turning turned. and "Optical/Slipring Test".

the steering wheel from 1" at several steering
lock to lock. wheel positions.

8. With IGN switch in a. Radio responds to a. If button is inoperative
RUN or ACCY and radio all controls. All and does not have a
on, operate all control buttons have a similar similar "feel" to all the
head controls. "feel". others, repair/replace
control head.

b. If all buttons "feel" good and some buttons do operate, perform "Remote Control System Test".
c. If no buttons operate and illumination is also out, perform "Control Head Power Supply Test".
d. If no buttons operate and illumination is on, perform "Control Head Power Supply Test", "Remote Control System Test" then "Optical/Slipring Test 1" until the problem is found.

2. Speaker Test

If one or more speakers does not operate, test by substituting a known-good speaker designed for an ARC radio. If the substitute speaker works, replace the speaker. If the substitute speaker does not work, check the wiring to that speaker by connecting the substitute speaker directly to the radio.

3. Antenna Test

Check connectors at radio and antenna ends of coaxial antenna cable. Connect a known-good test antenna to the radio. The test antenna must be designed for use with ARC radios, as ARC radios use a different size of antenna connection than conventional radios. Replace the antenna and/or coaxial cable if the test antenna works.

FIGURE 5 - CONNECTOR C214 (ON-CAR):

CONTROL HEAD POWER SUPPLY TEST

To expose the connector used in this test, remove the steering column filler panel (see Figure 103; Section 8C). See Figure 5 for the on-car connector location.

Connector Chart

Figures 5 and 6 This chart is used in the same way as the "Sound System Check Chart". With connector C214 still connected, backprobe the terminals on C214 given in Column 1, and check for the proper result given in Column 2. If you do not get the expected result given in Column 2, see Column 3 for the appropriate action to take. All tests in this chart are to be performed with connector C214 still connected and with the IGN switch in the RUN or ACCY position.