SECTION 12C - INSTRUMENTS, WIPERS/
WASHERS & HORN
CAUTION:
This vehicle will be equipped with a Supplemental Restraint System (SRS). A SRS will consist of either
seat belt pre-tensioners and a driver's air bag, seat belt pre-tensioners and a driver's and front
passenger's air b ags o r seat b elt p re-t ension ers, driv er’s an d f ron t p asseng er’s air bag and left and righ t
hand side air bags. Refer to SAFETY PRECAUTIONS, Section 12M Supplemental Restraint System
before performing any se rvice operation on, or around any S RS components, the steering mechanism or
wiring. Failure to follow the SAFETY PRECAUTIONS could result in SRS deployment, resulting in
possible personal injury or unnecessary SRS system repairs.
1. GENERAL INFORMATION
With the addition of two kilometre increments on the speedometer, VT Series Models with Production Options
(P.O.) 9C1 and A8V use the same instrument cluster as standard Executive Models with the single window liquid
display trip computer.
The ins trument c luster , when f itted during produc tion, is progr ammed f or Police Mode. In this mode, the over s peed
warning feature in the trip computer is substituted for a digital speed readout.
NOTE: This feature is TECH 2 programmable (i.e. can be turned enabled or disabled).
Other features, fitted to VT Series Models with P.O. 9C1 and A8V are;
On latter VT Series I Models and all VT Series II Models, the interior lights out feature uses an ON / OFF switch.
When switched on, the interior lights will not turn on when the doors ar e opened or the glove c ompar tment lamp will
not turn on when the glove compartment is opened. The switch for this feature is located on the instrument panel
facia, below the trip computer switch.
Dual horns (as fitted to Calais) are fitted to the vehicle behind the front bumper facia.
Excluding programming and calibrating the instrument cluster in ‘Police Mode’, all information relating to
instruments, wipers/washers and horns is as detailed in one of the following Sections:
Section 12C INSTRUMENTS, WIPERS/WASHER AND HORNS - VT Series I Service Information.
Section 12C INSTRUMENTS, WIPERS/WASHER AND HORNS - VT Series II Service Information.
NOTE: Refer to Section 12B LIGHT ING SYSTEM of this Service Inform ation CD for the removal, installation and
testing procedure for the interior lights out switch.
2. INSTRUMENT DIAGNOSTICS
2.1 INSTRUME NT CLUSTER PROGRAMMING
The f ollowing infor mation relates to pr ogramming ins trument c luster as semblies to meet the unique r equirements of
the Police Department. For all other diagnostic information, inc luding testing and program ming infor mation, refer to
Section 12C INSTRUMENTS, WIPERS/WASHERS AND HORNS of the VT Series I Service Information or
Section 12C INSTRUMENTS, WIPERS/WASHERS AND HORNS of the VT Series II Service Information.
NOTE: For additional information regarding TECH 2, refer to Section 12C INSTRUMENTS, WIPERS/WASHERS
AND HORNS of the VT Series I Service Inf ormation and Sect ion 12C INSTRUM ENTS, WIPERS/WASHERS AND
HORNS of the VT Series II Service Information or for more specific information, Section 0C TECH 2 of the VT
Series I Service Information.
Police Mode - Program
NOTE: Police Mode should be programmed during production as should replacement instrument clusters for
vehicles with P.O. 9C1 and A8V.
1. Connect TECH 2 to the DLC, select: Diagnostics / the appropriate Model Year / VT Commodore / Body /
Instrum ent / Tur n Ignition ON and conf irm the inf orm ation displayed by TECH 2 / Progr am / Options and follow
TECH 2 instructions.
2. When ‘Police Mode’ is displayed on the TECH 2 screen, press the Modify soft key and then the Enable soft key.
3. Continue to follow the TECH 2 instructions, press the Program soft key when instructed – Programming
Successful should be displayed.
Speedometer Pulses – Program
The instrument configuration speedom eter pulses must be programm ed into the instrument cluster to compensate
for different tyre sizes.
This procedure does not vary for police vehicles and is as detailed in Section 12C INSTRUMENTS,
WIPERS/WASHERS AND HORNS of the VT Series II Service Information (VT Series I and II).
Police Mode Calibration
NOTE: The following procedures is only applicable to instrum ent clus ters that have been pr ogram m ed to operate in
Police Mode (Police Mode enabled).
Method 1 – Using the trip computer switch
1. Turn ignition OFF
2. Hold down the three buttons on the trip computer; MODE, ▼ and ▲.
3. Turn ignition ON while holding down all three trip computer buttons
4. After three seconds release the MODE button, then release the ▼ and ▲ buttons.
The calibration value (in percentage) and “CAL” will be displayed.
5. The calibration value can now be adjusted up using the ▲ button and down using the ▼ button.
The value using this method can be adjusted in 0.1% increments
6. Once the required percentage value has been programmed, press the MODE button to lock in the calibration
and return to the normal display.
Method 2 – Using TECH 2
1. Connect TECH 2 to the DLC, select: Diagnostics / the appropriate Model Year / VT Commodore / Body /
Instrument / Turn Ignition ON and confirm the information displayed by TECH 2 / Program / Instrument
Configuration and follow TECH 2 instructions.
2. When ‘Speedometer Calibration’ is displayed on the TECH 2 screen, press the Modify soft key, type the
required percentage value (80% - 120%) and press the Enter key.
To enter a value less than 100%, type a 0 before the number; for exam ple to enter 90%, type 090, then press
Enter.
3. Continue to follow TECH 2 instruc tions , pr ess the Pr ogram s of t key when instruc ted – Pr ogramming Succ es s f ul
should be displayed.