Pictures & Descriptions of the Connectors to the Fujitsu / Denso OEM Navigation Screen (Head Unit) on a 2003 Toyota 4Runner Limited Edition (LE)

Special Thanks To Rando for providing a lot of this information!

The Connectors (Left to Right, Top to Bottom):

5-Pin Connector (Sensor signals):

       

(Right Picture) From Right to Left:

  • Pin 1: PKB (Parking Break. This signal is grounded when parking break switch is closed. Floats otherwise) - Input - Connected

  • Pin 2: Not Used - Not Connected

  • Pin 3: SPD (Generated from the Speedometer. Most likely this is the Vehicle speed sensor pulse line) - Input - Connected

  • Pin 4: TST (Test?) - Input - Not Connected

  • Pin 5: REV (Reverse Signal. This signal is tied to +12v when the car is in reverse) - Input - Connected


10-Pin Connector (Video & Communications):

       

(Right Picture) From Right to Left, Top to Bottom:

  • Pin 1: VR (Grounded when Ignition Switch is Off) - Neither Input nor Output - Connected

  • Pin 2: R (Red VGA) - Input - Connected

  • Pin 3: B (Blue VGA) - Input - Connected

  • Pin 4: Not Used - Not Connected

  • Pin 5: TX+ (Transmission+) - In/Out - Connected

  • Pin 6: VG (Ground/Shield) - Neither Input nor Output - Connected

  • Pin 7: G (Green VGA) - Input - Connected

  • Pin 8: SYNC (Probably VSync, Grounds for about .5 X 10^-6s every 6.5 X 10^-6s) - Input - Connected

  • Pin 9: Not Used - Not Connected

  • Pin 10: TX- (Transmission-) - In/Out - Connected


6-Pin Connector (DVD Changer Video)

       

(Right Picture) From Right to Left, Top to Bottom

  • Pin 1: TX+ (Transmission+) - In/Out - Not Connected

  • Pin 2: Not Used - Not Connected

  • Pin 3: NTSC - Input - Connected

  • Pin 4: TX- (Transmission-) - In/Out - Not Connected

  • Pin 5: SLD (Shield/Ground for 3 & 6) - Neither Input nor Output - Connected

  • Pin 6: SGND (?? Ground) - Neither Input nor Output - Connected


4-Pin Connector (Reverse Camera Video and Power)

       

(Right Picture) From Right to Left, Top to Bottom

  • Pin 1: V+ (Positive Voltage Terminal?? Referred to as B-Eye on Schematics, Probably a composite video signal) - Input - Connected

  • Pin 2: CA+ (??) - Output - Connected

  • Pin 3: V- (Negative Voltage Terminal?? Referred to as B-Eye-In on Schematics, probably a composite video signal) - Input - Connected

  • Pin 4: GND (Ground) - Neither Input nor Output - Connected


20-Pin Connector (Bottom Left, When Looking At Rear of Unit) (Power, Audio Outputs)

       

(Right Picture) From Right to Left, Top To Bottom

  • Pin 1: BU+B (Battery +12V) - Input - Connected

  • Pin 2: ILL+B (Light Control Switch On +12V) - Input - Connected

  • Pin 3: AMP+B (??) - Output - Not Connected

  • Pin 4: Not Used - Not Connected

  • Pin 5: TX+ (Transmission+) - In/Out - Connected

  • Pin 6: Not Used - Not Connected

  • Pin 7: Mute (Radio Switch is On = Logical 1) - Output - Connected

  • Pin 8: R+ (Right Audio Out Positive) - Output - Connected

  • Pin 9: L+ (Left Audio Out Positive) - Output - Connected

  • Pin 10: SLD (Common Ground For Audio Signals) - Neither Input nor Output - Connected

  • Pin 11: ACC+B (+12V when key is in ACC/AUX/ON position) - Input - Connected

  • Pin 12: ILL- (Light Control Switch On +12V) - Output - Connected

  • Pin 13: ANT+B (+12V Power to Antenna Amplifier when Radio Switch is On) - Output - Connected

  • Pin 14: Not Used - Not Connected

  • Pin 15: TX- (Transmission-) - In/Out - Connected

  • Pin 16: Not Used - Not Connected

  • Pin 17: Not Used - Not Connected

  • Pin 18 - R- (Right Audio Out Negative) - Output - Connected

  • Pin 19 - L- (Left Audio Out Negative) - Output - Connected

  • Pin 20 - GND (Ground) - Neither Input nor Output - Connected


12-Pin Connector (Rear audio controller, DVD Changer Audio)

       

(Right Picture) From Right to Left, Top to Bottom

  • Pin 1: SLD (Shield/Ground) - Neither Input nor Output - Connected

  • Pin 2: R+ (Right Audio Input Positive) - Input - Connected

  • Pin 3: R- (Right Audio Input Negative) - Input - Connected

  • Pin 4: L+ (Left Audio Input Positive) - Input - Connected

  • Pin 5: L- (Left Audio Input Negative) - Input - Connected

  • Pin 6: Mute (Logical 1 when Radio Switch is On) - Input - Connected

  • Pin 7: GND (Ground) - Neither Input nor Output - Not Connected

  • Pin 8: Not Used - Not Connected

  • Pin 9: TX+ (Transmission+) - In/Out - Connected

  • Pin 10: TX- (Transmission-) - In/Out - Connected

  • Pin 11: ACC+B (+12V when key is in ACC/AUX position) - Output - Not Connected

  • Pin 12: BU+B (Battery +12V) - Output - Not Connected


20-Pin Connector (Bottom Right, When Looking at Rear of Unit) (Rear Controller Audio, Steering Wheel Controls)

       

(Right Picture) From Right to Left, Top to Bottom

  • Pin 1: Not Used - Not Connected

  • Pin 2: Not Used - Not Connected

  • Pin 3: Not Used - Not Connected

  • Pin 4: CMP+ (??) - Output - Not Connected

  • Pin 5: CMP- (??) - Output - Not Connected

  • Pin 6: GND (Ground from Steering wheel audio controls) - Neither Input nor Output - Connected

  • Pin 7: SW1 (Seek+/-, Vol+/- Inputs from Steering wheel audio controls) - Input - Connected

  • Pin 8: SW2 (Mode input from Steering wheel audio controls) - Input - Connected

  • Pin 9: TX1+ (Transmission1+) - In/Out - Not Connected

  • Pin 10: TX1- (Transmission1-) - Not Connected

  • Pin 11: Not Used - Not Connected

  • Pin 12: Not Used - Not Connected

  • Pin 13: Not Used - Not Connected

  • Pin 14: SLD1 (Shield/Ground) - Neither Input nor Output - Connected

  • Pin 15: RSR+ (Audio Signal to Rear Audio Controller, For Wireless Headphones) - Output - Connected

  • Pin 16: RSR- (Audio Signal to Rear Audio Controller, For Wireless Headphones) - Output - Connected

  • Pin 17: RSL+ (Audio Signal to Rear Audio Controller, For Wireless Headphones) - Output - Connected

  • Pin 18: RSL- (Audio Signal to Rear Audio Controller, For Wireless Headphones) - Output - Connected

  • Pin 19: RMU (Mute Signal to Rear Audio Controller, Logical 1 when Radio Switch is On) - Output - Connected

  • Pin 20: Not Used - Not Connected