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  Note: This unit is for vehicles with a 12-volt battery and negative grounding. Before installing it in a recreational vehicle, truck, or bus, check the battery voltage.

To avoid shorts in the electrical system, be sure to disconnect the minus (-) battery cable before beginning installation. Refer to the owner’s manual for details on connecting the power amp and other units, then make connections correctly. Secure the wiring with cable clamps or adhesive tape. To protect the wiring, wrap adhesive tape around them where they lie against metal parts.

Route and secure all wiring so it cannot touch any moving parts, such as the gear shift, handbrake and seat rails. Do not route wiring in places that get hot, such as near the heater outlet. If the insulation of the wiring melts or gets torn, there is a danger of the wiring short-circuiting to the vehicle body.

Don’t pass the yellow wire through a hole into the engine compartment to connect to the battery. This will damage the wire insulation and cause a very dangerous short.

Do not shorten any wires. If you do, the protection circuit may fail to work when it should.

Never feed power to other equipment by cutting the insulation of the power supply wire of the unit and tapping into the wire. The current capacity of the wire will be exceeded, causing overheating.

When replacing fuse, be sure to use only fuse of the rating prescribed on the fuse holder.

Since a unique BPTL circuit is employed, never wire so the speaker wires are directly grounded or the left and right (-) speaker wires are common.

If the RCA pin jack on the unit will not be used, do not remove the caps attached to the end of the connector.

Speakers connected to this unit must be high power types with minimum rating of 50 W and impedance of 4 to 8 ohms. Connecting speakers with output and/or impedance values other than those noted here may result in the speakers catching fire, emitting smoke or becoming damaged.

When this product’s source is switched ON, a control signal is output through the blue/white wire. Connect to an external power amp’s system remote control or the car’s Auto-antenna relay control terminal (max. 300 mA 12 V DC). If the car features a glass antenna, connect to the antenna booster power supply terminal.

When an external power amp is being used with this system, be sure not to connect the blue/white wire to the amp’s power terminal. Likewise, do not connect the blue/white wire to the power terminal of the auto-antenna. Such connection could cause excessive current drain and malfunction.

To avoid short-circuiting, cover the disconnected wire with insulating tape. Especially, insulate the unused speaker wires without fail. There is a possibility of short-circuiting if the wires are not insulated.

To prevent incorrect connection, the input side of the IP-BUS connector is blue, and the output side is black. Connect the connectors of the same colors correctly. 

The black wire is ground. Please ground this wire separately from the ground of high-current products such as power amps. If you ground the products together and the ground becomes detached, there is a risk of damage to the products or fire.


ANT Power Antenna Wire (Blue) Connect this wire to the +B terminal of your power antenna, if applicable. Power for Electric Antenna. Output from the stereo +12 V (maximum 150 - 300mA) power supply for automatic or electronic antennas.

REM Remote Turn-On Wire (Blue/White) Connect this wire to the remote turn-on wire of your amplifier or signal processor.

B+ Battery Wire (Yellow) Connect this wire to the positive (+) post of the vehicle’s battery. Memory Power (12V direct from Battery). Connects the radio directly to the battery.

ACC Switched Power Wire (Ignition) (Red) Connect this wire to an open terminal on the vehicle’s fuse box or another unused power source which provides (+) 12V only when the ignition is turned on or in the accessory position. +12V Main Power (Switched via Ignition key). +12 V with the ignition key is in the ACC or ON position.

GND Ground Wire (Black) Connect this wire to a good chassis ground on the vehicle. Make sure the connection is made to bare metal and is securely fastened using the sheet metal screw provided.

ILLUMI DIMMER Illumination Wire (Orange This wire may be connected to the vehicle’s instrument cluster illumination wire. This will allow the backlighting of this unit to dim whenever the vehicle’s lights are turned on. Dial-light illumination (car side light circuit). +12 V input on the car when the lights are on. For some it actually illuminates the radio display - the others can dim the lights. If the dashboard of your car has a light control function, this pin should be connected in order to regulate the brightness. The wire from lighting a cigarette lighter can be used for the same purposes.

SCV Speed-dependent volume control, speed signal This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor. Note: If the speedometer stops working when the radio is connected, then the pin is probably grounded because radio probably uses this pin for another function, except for GALA.

MUTE Mute from Cell-Phone. This pin is used to silence the audio, earthed by some other external components such as a mobile phone that is connected to the radio.

REV the reversing light switch. +12 V input on the radio with the ignition switched on the ignition and the car is in gear to move backwards. Used for reversing lamp signal on Becker radios with navigation.

RF+ Right Front (+) Speaker Output Wire (Gray)

RF- Right Front (−) Speaker Output Wire (Gray/Black)

LF- Left Front (−) Speaker Output Wire (White/Black)

LF+ Left Front (+) Speaker Output Wire (White)


RR- Right Rear (−) Speaker Output Wire (Violet/Black)

RR+ Right Rear (+) Speaker Output Wire (Violet)

LR+ Left Rear (+) Speaker Output Wire (Green)

LR- Left Rear (−) Speaker Output Wire (Green/Black)


KL 30 Battery (+)

KL 31 Battery (-)


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