Re: Retrofit D2/P38 Cruise Control ECU into your D1
Reinstall. It fits perfectly in the stock location.
Selecting a D2/P38 cruise control ECU:
There are several different tunes for the D2/P38 cruise control ECUs, depending on engine size (4.0 vs 4.6). If you have a 3.9 or 4.0 engine, get an ECU from a 4.0 D2/P38 for smoothest operation. A 4.6 ECU will work, but with less smooth operation.
Make sure it includes the pigtail so you can make an adapter. Our common used LR parts suppliers can do this upon request.
Pinouts:
D2 and Bosch P38 cruise control ECU's use the same pinout but with different pigtail wire colors. Use this pinout information to match you old D1/GEMS P38 ECU's connector pins to the new ECU's pigtail. D1 and GEMS P38 wire colors are the same but pinout is different. The Diagnostic Line wire will be unused in the conversion.
D1 cruise control ECU (AMR 1173):
Pin 1: Orange/Blue - Actuator Pump Power
Pin 2: Not Used
Pin 3: Grey/Yellow - Set Button (from inverter)
Pin 4: Red/Yellow - Resume Button (from inverter)
Pin 5: Green/Purple - Brake Light Switch
Pin 6: Orange/Pink - Actuator Valve Control
Pin 7: Orange/Red - Actuator Pump Control (thicker gauge)
Pin 8: Black - Earth or Ground
Pin 9: Orange/Red - Brake Pedal Vent Switch (thinner gauge)
Pin 10: Orange/White - ECU Power +
Pin 11: Yellow - Speed Signal
There are two wires with the same color-code of Orange/Red but one is thicker than the other as noted above
D2 cruise control ECU (AMR 5700):
Pin 1: Orange/Red - Brake Pedal Vent Switch
Pin 2: Red/Yellow - Resume Button
Pin 3: Not Used
Pin 4: Grey/Yellow - Set Button
Pin 5: Green/Purple - Brake Light Switch
Pin 6: Not Used
Pin 7: Orange/Red - Actuator Pump Control
Pin 8: Orange/White - ECU Power +
Pin 9: Not Used
Pin 10: Not Used
Pin 11: Orange/Blue - Actuator Pump Power
Pin 12: Not Used
Pin 13: Not Used
Pin 14: Not Used
Pin 15: Yellow - Speed Signal
Pin 16: Pink/Red -Diagnostic Line (Unnecessary for conversion to GEMS)
Pin 17: Orange/Pink - Actuator Valve Control
Pin 18: Black - Earth or Ground
D2 cruise control ECU (AMR 5700):
Pin 1: Purple/Green - Brake Pedal Vent Switch
Pin 2: Blue/White - Resume Button
Pin 3: Not Used
Pin 4: Red/White - Set Button
Pin 5: Green/Grey - Brake Light Switch
Pin 6: Not Used
Pin 7: Black/Red - Actuator Pump Control
Pin 8: White/Yellow - ECU Power +
Pin 9: Not Used
Pin 10: Not Used
Pin 11: White/Blue - Actuator Pump Power
Pin 12: Not Used
Pin 13: Not Used
Pin 14: Not Used
Pin 15: Pink/Green - Speed Signal
Pin 16: Pink - Diagnostic Line (Unnecessary for conversion to GEMS)
Pin 17: Black/Yellow - Actuator Valve Control
Pin 18: Black - Earth or Ground
D2 to D1/GEMS P38 Conversion
White/Blue -> Pin 1: Orange/Blue
Red/White -> Pin 3: Grey/Yellow
Blue/White -> Pin 4: Red/Yellow
Green/Grey -> Pin 5: Green/Purple
Blue/Yellow -> Pin 6: Orange/Pink
Black/Red -> Pin 7: Orange/Red (*thicker gauge)
Black -> Pin 8: Black
Purple/Green -> Pin 9: Orange/Red (*thinner gauge)
White/Yellow -> Pin 10: Orange/White
Pink/Green -> Pin 11: Yellow