Metra Chevrolet/GMC 1988-1994 99-3000/AW-333GM Installation Guide

: June 7, 2024
: Metra

Table of Contents

Applications
Dash Disassembly
Kit Preparation
References
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INSTALLATION INSTRUCTIONS FOR PART 99-3000

APPLICATIONS
See application list inside
Chevrolet/GMC 1988-1994
99-3000/AW-333GM Metra Chevrolet GMC 1988-1994 -

KIT FEATURES

DIN head unit provision
ISO head unit provision

KIT COMPONENTS

A) Radio housing
B) ISO brackets

Metra Chevrolet GMC 1988-1994 - brackets

WIRING & ANTENNA CONNECTIONS (sold separately)
Wiring Harness:

70-1858 – GM harness 1987-2005

Antenna Adapter:

40-GM10 – GM antenna adapter

TOOLS REQUIRED

Panel removal tool
Phillips screwdriver
Small flat blade screwdriver
Cutting tool
Scribe

CAUTION: Metra recommends disconnecting the negative battery terminal before beginning any installation. All accessories, switches, and especially airbag indicator lights must be plugged in before reconnecting the battery or cycling the ignition.
NOTE: Refer to the instructions included with the aftermarket radio.

Applications

Chevrolet
Full-size Blazer …………………………………………….. 1992-1994
Full-size pickup …………………………………………….. 1988-1994
Suburban …………………………………………………….. 1992-1994
GMC
C-Series ……………………………………………………… 1988-1994
Suburban …………………………………………………….. 1992-1994
Yukon …………………………………………………………. 1992-1994

Dash Disassembly

Pull out on the bottom of the radio trim bezel.
Unhook the top corners of the bezel and remove. (Figure A)
Remove the metal fastening clips from the bottom of the factory dash panel and attach them to the same location on the radio housing (rear inside corner view shown). (Figure B)
Continue to kit preparation

Kit Preparation

Remove the A/C vents from the factory dash panel by releasing the spring fastening clips securing them to the panel.
Mount the vents to the radio housing by inserting the inner edge of the vent into the center inside pivot hole and the outer edge of the vent into the outer pivot hole.

Using the same metal spring clips and mounting procedures from the original truck panel to mount the vents to the radio housing. (Figure A)
Continue to kit assembly
Metra Chevrolet GMC 1988-1994 - FIG 1 Kit Assembly

DIN head unit provision

Slide the DIN cage into the radio housing and secure by bending the metal locking tabs outward.(Figure A)
Slide the aftermarket radio into the cage until it snaps into place. (Figure B)
Locate the factory wiring harness in the dash.
Metra recommends using the proper mating adapter from Metra or AXXESS. Re- connect the negative battery terminal and test the unit for proper operation.
Reassemble dash in reverse order of disassembly.

Metra Chevrolet GMC 1988-1994 - FIG 2

ISO head unit provision

Mount the ISO brackets to the radio using the screws supplied with the radio. (Figure A)
Slide the radio into the radio housing until the ISO brackets snap into place. (Figure B)
Locate the factory wiring harness in the dash.
Metra recommends using the proper mating adapter from Metra or AXXESS. Re- connect the negative battery terminal and test the unit for proper operation.
Reassemble dash in reverse order of disassembly.

Metra Chevrolet GMC 1988-1994 - FIG 3

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