Identifying Concerns - Hummer H1 Service Manual

12-144 Electrical System
AUDIO (DELCO STANDARD) ELECTRICAL
HARNESS (MODEL 90) REPLACEMENT
Removal
1. Remove engine cover console.
2. Disconnect harness lead from radio head (Figure 12-142).
3. Remove four screws, clips, cover, backing plate and right
front speaker from trim (Figure 12-144).
.
BACKING PLATE
SPEAKER
COVER
Figure 12-144: Right Front Speaker Model 90.
4. Disconnect two leads from right front speaker.
5. Repeat steps 3 and 4 for left front speaker.
6. Remove four screws, clips, cover, and right rear speaker
from trim (Figure 12-145).
TRIM
SPEAKER
Figure 12-145: Right Rear Speaker Model 90.
7. Disconnect two leads from right rear speaker.
8. Repeat steps 7 and 8 for left rear speaker.
9. Remove trim as necessary to gain access to harness.
10. Remove audio harness from vehicle.
4-1-00
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Installation
1. Route audio harness to approximate mounting position.
2. Secure harness to vehicle with duct tape, where necessary.
3. Install trim.
4. Connect two leads to right rear speaker (Figure 12-145).
5. Install right rear speaker and cover on trim and secure with
four clips and screws.
6. Repeat steps 4 and 5 for left rear speaker.
7. Connect two leads to right front speaker (Figure 12-144).
8. Install right front speaker and cover on trim with four clips
and screws.
9. Repeat steps 7 and 8 for left front speaker.
10. Connect harness lead to radio head.
11. Install engine cover console.
DIAGNOSIS -DELCO AUDIO SYSTEM
1. Verify customer complaint.
2. Follow radio service procedures.
3. If technical service is required, have all the pertinent
information ready before placing the call.
NOTE: Before performing any diagnostic procedures or using
any diagnostic tools, check wiring schematics for component
circuitry to determine the location of fuses and circuit breakers
in the circuit. Fuses and circuit breakers must be in good work-
ing order to perform proper diagnostic procedures.
Delco Audio System Diagnostic Kit J–39916-A is available
from Kent-Moore. The kit contains a diagnostic CD and cas-
sette, a head cleaner cassette and instructions. This kit is de-
signed to isolate the type of malady and the area of its origin by
producing tones of various frequencies. By adjusting the fade
and balance, a technician can evaluate the sound quality pro-
duced in different areas of the system.

Identifying Concerns

• Check for technical service bulletins.
• For reception concerns, determine if the station is ob-
• To test for audio reception/noise, position the vehicle
• Duplicate the customers complaint before trying to di-
• Before diagnosing, identify components, their features
• Determine if any aftermarket equipment is installed on
• Perform the following steps to identify a noisy component:
tainable in the customers listening area.
outside the building with the hood down.
agnose the system. Have the customer demonstrate the
condition. Test drive the vehicle with the customer and
then test drive another similar model vehicle (with a
similar audio system) to do a comparison of the two ve-
hicles to determine if the condition is abnormal.
and the customer's complaint.
the vehicle. Disconnect the aftermarket equipment and
determine if the customers complaint still exists.
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