[. . . ] If your vehicle's ignition does not have an ACC position, or if the ignition wire is connected to a power source with constant voltage such as a battery wire, the power will not be linked with the ignition (i. If you want to link the unit's power with the ignition, connect the ignition wire to a power source that can be turned on and off with the ignition key. Use a commercially available conversion connector if the connector does not fit in the vehicle connector. [. . . ] Also avoid places with too much dust or the possibility of water splashing. If the power is not turned ON ("PROTECT" is displayed), the speaker wire may have a short-circuit or touched the chassis of the vehicle and the protection function may have been activated. Make sure that all wire connections are securely made by inserting jacks until they lock completely. Connect to vehicle's reverse lamp harness when using the optional rear view camera. To use the steering wheel remote control feature, you need to an exclusive remote adapter (not supplied) matches your car is required. Connect to the terminal that is grounded when either the telephone rings or during conversation. Connect either to the power control terminal when using the optional power amplifier, or to the antenna control terminal in the vehicle. If no connections are made, do not let the cable come out from the tab. The pin arrangement for the ISO connectors depends on the type of vehicle you drive. Make sure to make the proper connections to prevent damage to the unit. the default connection for the wiring harness is described in 1 below. If the ISO connector pins are set as described in 2 or 3, make the connection as illustrated. Please be sure to reconnect the cable as shown 2 below to install this unit to the Volkswagen vehicles etc. 1 (Default setting) The A-7 pin of the vehicle's ISO connector is linked with the ignition, and the A-4 pin is connected to the constant power supply. [. . . ] Engage the catch pins on the removal tool 2 and remove the two locks on the lower level. Remove the Hex-head screw with integral washer (M4 × 8) on the back panel. Insert the two removal tools 2 deeply into the slots on each side, as shown. [. . . ]