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FINAL ASSEMBL Y
1
Make wiring connections using the EIA color code chart shown below and the instructions included
with the head unit. Metra recommends making connections as shown below; Strip, Splice, Solder,
Tape. Isolate and individually tape off ends of any unused wires to prevent electrical short circuit.
All connections should be made without the harness plugged into the 99-3303.
A
B
C
D
METRA / EIA WIRING CODE
12V Ignition / Acc . . . Red
12V Batt / Memory . . Yellow
Ground . . . . . . . . . . . Black*
Power Antenna . . . . . Blue
Amp Turn-On . . . . . . Blue / White
Amp Ground . . . . . . . Black / White
Illumination. . . . . . . . Orange
Dimmer . . . . . . . . . . Orange / White
*NOTE: When Black a wire is not present, ground radio to vehicle chassis.
All colors may not be present on all leads due to manufacturer's specifications.
2
Plug the clear 10 way and 12 way connectors into the back of the 99-3303 housing.
3
Connect the Lt. Blue 24 way connector to the factory 24 way harness.
4
On vehicles equipped with Onstar, connect the Black 12 way connector to the factory
12 way harness.
5
Re-connect the negative battery terminal and test the unit for proper operation.
6
Reassemble dash in reverse order of disassembly.
99-3303
A)
B)
C)
D)
7
FINAL ASSEMBL Y
Strip wire ends back 1/2"
Twist ends together
Solder
Tape
Right Front (+) . . . . . Gray
Right Front (-). . . . . . Gray / Black
Left Front (+) . . . . . . White
Left Front (-) . . . . . . . White / Black
Right Rear (+). . . . . . Violet
Right Rear (-) . . . . . . Violet / Black
Left Rear (+). . . . . . . Green
Left Rear (-) . . . . . . . Green / Black
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