Electrics Test 1

In Stage 45 and Stage 46 of our 1:8 scale Knight Rider K.I.T.T. partwork build, we assembled the wearable and wireless ComLink Wristwatch that will be used to remotely control the model’s electronic functions. At the end of Stage 45, the magazine instructions would have had us test all of our electronics for the first time. However, I chose to complete the watch first, so I moved the testing process and the ComLink operation to this page.

Initial ComLink Setup

The ComLink Wristwatch has five buttons that control various functions of the model. But, for the initial setup, we only need these four:

To set the TIME:
  • HOLD the Dial (A) button for 3 seconds (it will count 01, 02, 03 on the screen)
  • PRESS the +/buttons to select between a 12-hour or 24-hour format
  • PRESS the Dial (A) button once to confirm
  • PRESS the +/buttons to set the seconds value
  • PRESS the Dial (A) button once to confirm
  • PRESS the +/buttons to set the minutes value
  • PRESS the Dial (A) button once to confirm
  • PRESS the +/buttons to set the hours value
  • PRESS the Dial (A) button once to confirm
To set the LANGUAGE of the voice clips played by the model’s Speaker (defaults to French):
  • HOLD the Speaker (B) button for 3 seconds (it will count 01, 02, 03 on the screen)
  • PRESS the +/buttons to select the appropriate voice language channel:
    • CH01 = French
    • CH02 = English
    • CH03 = Spanish
    • CH04 = Italian
    • CH05 = German
  • PRESS the Speaker (B) button once to confirm

Preparing for the first Electronics Test

NOTE: I completed this first electronics test once I finished building Stage 46.

Step 1

Retrieve your Chassis and your Front Bumper and position the Bumper near the front of the Chassis:

Connect the plug of the Scanner Light Printed Circuit Board (marked ‘A’) to the free end of the Front Scanner Wire (marked ‘A’), as shown:

Step 2

Install four (4) AAA batteries (not included with the model) into the Battery Compartment and slide the Switch to the ‘ON’ position:

Lighting Test Part 1

During normal operation of controlling our K.I.T.T. model, the five buttons of the ComLink Wristwatch each have a specific purpose:

PRESS the Dial (POWER) button once to initiate the K.I.T.T. startup sequence. This should cause the model to play a sequence of sounds and trigger the following events:

  • The Pop-Up Headlights Motor (43C) should rotate for a few seconds counter-clockwise (when looking at the end of the gear):

  • The following LEDs at the front of the Chassis should light up in a timed pattern:
    • 42G – Front/Fog Lights (marked ‘R’)
    • 43B – Headlights (marked ‘M’)
    • 44B – Keypad (marked ‘G’)
    • 44C – Dashboard Monitors (marked ‘H’)
    • 44D – Front Panel and Voice Lights (marked ‘O’)
    • 44E – Dashboard Instrument Panel 1 (marked ‘J’)
    • 44F – Dashboard Instrument Panel 2 (marked ‘L’)
    • 44H – Steering Column Pods (marked ‘I’)
    • 44I – Lower Center Console (marked ‘V’)
  • The following LEDs at the rear of the Chassis should also light up:
    • 43E – Overhead Console 01 (marked ‘K’)
    • 43G – Overhead Console 02 (marked ‘W’)
    • 43I – Left Tail Lights (marked ‘E’)
    • 43J – Right Tail Lights (marked ‘E’)
    • 43L – Rear License Plate (marked ‘P’)

PRESS the upper-right (SCANNER) button once to turn the Front Scanner on/off and play the matching sound effect.

On my model, when I pressed the SCANNER button all of the electronics just turned off. I followed the troubleshooting steps listed at the bottom of this page and found I was affected by the faulty C3 capacitor on my Scanner Light PCB. See that section below for more details:

Audio Test

  • PRESS the Speaker (MUSIC) button to play/stop the Knight Rider theme song.
  • PRESS the left (ENGINE) button once to play/stop K.I.T.T.’s turbine engine sound. This one is quite loud.
  • PRESS the lower-right (VOICE) button once each time to play through the following K.I.T.T. voice clips:
    • “I am the voice of Knight Industries Two Thousand’s microprocessor. K I T T for easy reference. KITT if you prefer.”
    • “I project odds of a thousand to one against my meeting a more compatible human than yourself.”
    • “I am not qualified to overrule your wishes.”
    • “Yes, Michael.”
    • “As Michael would say, thanks pal.”

TIP: If you want to have your Scanner lights moving but without any sound playing, press the ENGINE or MUSIC button twice to override the sound effect and then go quiet. This mode could be helpful if you want to display your model silently, but have the Scanner running.

Lighting Test Part 2

One at a time, activate the switches on the ends of the Left Door Switch and Right Door Switch wires (42D and 42E both marked ‘B’):

Operating either of these switches should light up the two Floor Lights (44A marked ‘F’):

Activate the switch on the end of the Brake Pedal wires (44G marked ‘E’):

This should cause both pairs of Tail Lights (43I and 43J marked ‘J’) to light up brighter than normal:

Finally, PRESS the Dial (POWER) button once again to initiate the K.I.T.T. shutdown sequence. The Pop-Up Headlights Motor should rotate in a clockwise direction for a few seconds and all lights should turn off in a timed pattern:

Troubleshooting the Electronics

  • If you find that the watch does not activate any functions of the car, make sure you are using a brand new CR2032 battery.
  • Disconnect all connections from the Circuit Board except for the ‘MOT’ wiring. Press the Dial (POWER) button to make sure the motor works. If not, check the connections for any damage and that they are seated fully and correctly inserted. If these connections are OK, you might have a faulty Circuit Board. You can confirm this by reconnecting one of the LEDs – if it does not light as expected, you may need to request a replacement Circuit Board.
  • Next, reconnect only the Front Scanner (marked ‘A’) to the Circuit Board and press the upper-right (SCANNER) watch button. If it does not come on (or as in my case, caused the entire car to shut down), we may need to remove a bad component from the Scanner Light PCB:

    • On the back of the Scanner Light PCB is a small capacitor marked ‘C3’. Either using a soldering iron or simply with some nail clippers, completely remove this component from the circuit board. This is what fixed the problem with my electronics:

  • One by one, reattach each connection to the Circuit Board and make sure they are seated fully and correctly inserted. Check the lights as you go to ensure each connection is working as expected.
  • If you find the Speaker does not play any sounds, check that connection as well.


I was a bit surprised to discover that the startup sequence turns various LEDs on in a specific pattern while playing sound effects along the way! The shutdown sequence is just as long, but if you don’t want to wait you can just slide the main power switch under the car to OFF. Either way, I recommend removing the AAA batteries from our car when not in use to prevent them from corroding over time.

Unfortunately, I did encounter the problem with the tiny C3 capacitor on my Scanner Light PCB, but the C3 fix mentioned above solved it without much trouble. I want to personally thank Chloe Powell from ModelModz for providing us all with these troubleshooting steps – they were a lifesaver!