7.0 GM 00 – 02 4.8L, 5.3L & 6.0L TBW VORTEC SYSTEM WIRE HARNESS INSTALLATION
INSTRUCTIONS
7.1 DASH SECTION INSTALLATION
Note: If you have not already done so, read sections 5.0 and 6.0 of these
instructions and think through the installation of the harness before securing or
cutting any wires.
The wires in this group consist of the diagnostic link connector (DLC) (SEE FIGURE 7.1), the
check engine light (pre-mounted into a mounting bracket), fuel pump relay, emissions devises
(optional) and 6 other wires.
CAUTION: DO NOT MAKE ANY CONNECTIONS WHILE THE COMPUTER IS PLUGGED
INTO THE HARNESS.
Note: Wire color (Example: Blk/Wht) is one wire with a stripe. The second color
(the stripe) may not be bold. Observe all two-color wires closely.
A. AC REQUEST – This is not a power supply for the compressor
This circuit is used to inform the PCM that the AC compressor has been turned on. This
wire is to be spliced into the circuit from the AC switch to the AC compressor.
B. BRAKE SW - These circuits are used to provide power to the TCC solenoid in the
automatic transmission. These wires will connect to the brake switch terminals that are
normally used for cruise control or TCC solenoid (normally closed). These wires do not
connect to the terminals for the brake lights. See table 4.1 for the recommended
brake switch. If you are using the recommended brake switch then you will wire it
according to Figure 7.2. The pink wire to the back of the switch in the illustration is the
wire that has power on it whether or not the brake is being applied. If your vehicle has a
pressure type brake switch, you may use a relay as shown in Figure 7.3. The relay must
be a SPDT Relay and wired correctly or it could result in a dangerous situation with the
vehicle. The torque converter may not unlock.
C. DLC - The Data Link Connector (DLC) Figure 7.1 is used to communicate with the PCM.
The Powertrain On Board Diagnostic (OBD) System Check is an organized approach to
identifying a problem created by an electronic powertrain control system malfunction. The
Powertrain OBD System Check is the starting point for any drivability concern diagnosis.
The Powertrain OBD System Check directs the installer to the next logical step in
diagnosing a drivability concern. Understanding and using the Powertrain OBD System
Check correctly will reduce the diagnostic time and prevent the replacement of good parts.
Mount the DLC connector using the bracket that the light is mounted in allowing access to
the front of the connector allowing you to see the light while driving. See Figure 7.1
D. FUEL TEST (use as needed) - This circuit is used to power the electric fuel pump for
test purposes only. Temporarily apply fused positive power to this wire for testing the fuel
pump.
7
(20 strony)
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