MBEC Connection
MBEC Connection
The MBEC (4) is located below the instrument panel to the left of the brake pedal as shown above.
The MBEC has 10 positions for connecting electrical connectors. One of these positions is designated for aftermarket utilization. Install a connector (P/N 20791502) into the open position identified as X14 as shown above.
Important
Connector P/N 20791502 comes with a one wire lead installed. This lead will need to be removed before the connector is pinned for use with a radio.
Within this connector, there is a fused 30 Amp battery feed, a fused 15 Amp battery feed, a fused 10 Amp Run/Crank feed, a 300 milliamp Retained Accessory Power (RAP) feed and a ground.
Caution
Do not connect any components to cavity 2 (15 Amp Battery Feed), or cavity 8 (300 milliamp RAP Feed). Adding electrical draw to any of these circuits can cause vehicle performance issues and potentially decreased life of the APM.
The pin out of the connector is as follows:
Wire Gauge Selection
For any of these powered connections to be used, circuit protection guidelines must be followed to assure that the circuit gauge is selected appropriately so that it will be protected by the fuse in case of a short circuit.
Relay Installation
Install relay (P/N 12193601) with 5-way pigtail connector (P/N 15306045) as shown in the above diagram to ensure the load from the radio is connected to the 30 amp Battery feed, and not the 10 amp Run/Crank circuit. Connect the 30 amp Battery Feed (circuit 2340) from pin 5 of the MBEC to pin 30 of the relay. Connect pin 87 of the relay to the radio. Connect the 10 amp Run/Crank (circuit 739) from pin 7 of the MBEC to pin 86 of the relay coil. Connect pin 85 of the relay coil to Ground (circuit 1050) on pin 1 of the MBEC.
Caution
To prevent damage to any sensitive electronic components, use the relay listed which includes a suppression resistor circuit. The integral suppression resistor will prevent a voltage spike from being transmitted onto the Run/Crank circuit. Damage to the vehicle by failing to install this relay as part of this aftermarket installation is not covered under warranty.
Parts Information
Accessory Installation Instructions (All 2011-2013 Hybrid Models, Excluding Escalade Platinum Hybrid)
The location for the accessory power and ground can be acquired at the Mid-Bussed Electrical Connector (MBEC). The power and ground can be connected at this location without having to splice or cut into the existing wiring. The total power available at the Mid-Bussed Electrical Connector (MBEC) location is 25 amps.
Danger
The wire harnesses and cables for the hybrid high voltage circuits are encased in an orange colored covering. In addition, high voltage components such as the Energy Storage System and high voltage cables are affixed with "High Voltage" red danger, and orange warning labels. The intermediate 42 volt system is encased in a blue colored covering, and has yellow caution labels on the components, wire harnesses, and cables. Do not remove, open, take apart, or modify these devices. Do not probe, tamper with, cut, or modify high voltage, or intermediate voltage cable or wiring.
MBEC Connection
The MBEC (4) is located below the instrument panel to the left of the brake pedal as shown above.
The MBEC has 10 positions for connecting electrical connectors. One of these positions is designated for aftermarket utilization. Install a connector (P/N 20791502) into the open position identified as X14 as shown above.
Important
Connector P/N 20791502 comes with a one wire lead installed. This lead will need to be removed before the connector is pinned for use with an accessory.
Within this connector, there is a fused 30 Amp battery feed, a fused 15 Amp battery feed, a fused 10 Amp Run/Crank feed, a 300 milliamp Retained Accessory Power (RAP) feed and a ground.
Caution
Do not connect any components to cavity 2 (15 Amp Battery Feed), or cavity 8 (300 milliamp RAP Feed). Adding electrical draw to any of these circuits can cause vehicle performance issues and potentially decreased life of the APM.
The pin out of the connector is as follows:
Wire Gauge Selection
For any of these powered connections to be used, circuit protection guidelines must be followed to assure that the circuit gauge is selected appropriately so that it will be protected by the fuse in case of a short circuit.
Relay Installation
Install relay (P/N 12193601) with 5-way pigtail connector (P/N 15306045) as shown in the above diagram to ensure the load from the accessory is connected to the 30 amp Battery feed, and not the 10 amp Run/Crank circuit. Connect the 30 amp Battery Feed (circuit 2340) from pin 5 of the MBEC to pin 30 of the relay. Connect pin 87 of the relay to the accessory. Connect the 10 amp Run/Crank (circuit 739) from pin 7 of the MBEC to pin 86 of the relay coil. Connect pin 85 of the relay coil to Ground (circuit 1050) on pin 1 of the MBEC.
Caution
To prevent damage to any sensitive electronic components, use the relay listed which includes a suppression resistor circuit. The integral suppression resistor will prevent a voltage spike from being transmitted onto the Run/Crank circuit. Damage to the vehicle by failing to install this relay as part of this aftermarket installation is not covered under warranty.
Parts Information
Available Power Distribution System (2011-2013 Tahoe/Yukon Hybrids with Hybrid Municipal Package RPO WRJ or WRK)
The Hybrid Municipal Package consists of a power distribution system integrated into the vehicle 12 volt electrical system at the front compartment (RPO WRJ) or front compartment and rear cargo area (RPO WRK). All aftermarket electrical equipment and accessories must be wired to the fused circuits provided in the upfitter 12 volt power distribution panels. The power and ground can be connected at these locations without having to splice or cut into the existing vehicle wiring. The total amount of power available to the panel(s) is 45 amps (540 watts). The power distribution system simplifies upfitting and avoids connection to critical components of the Hybrid vehicle electrical system.
The system consists of a 12 volt battery feed coming directly from the battery to an underhood fuse block. The underhood fuse block is protected by a fusable link in the feed wire coming from the battery. The underhood fuse block feeds the single front compartment fuse block (RPO WRJ) or both the front compartment and rear cargo area fuse block (RPO WRK) with direct 12 battery and ignition.
Both the front compartment and rear cargo fuse blocks are protected by maxi fuses in the underhood fuse block. There are two 50 amp maxi fuses, (1) to protect each fuse block battery circuit and two 30 amp maxi fuses, (2) to protect each relay and fuse block ignition circuit. The ignition is controlled through either a single relay (RPO WRJ) or dual relays (RPO WRK).
Chassis ground can also be accessed at both the front compartment and rear cargo area fuse blocks.
Accessing Power and Ground from the Power Distribution System
Danger
The wire harnesses and cables for the hybrid high voltage circuits are encased in an orange colored covering. In addition, high voltage components such as the Energy Storage System and high voltage cables are affixed with "High Voltage" red danger, and orange warning labels. The intermediate 42 volt system is encased in a blue colored covering, and has yellow caution labels on the components, wire harnesses, and cables. Do not remove, open, take apart, or modify these devices. Do not probe, tamper with, cut, or modify high voltage, or intermediate voltage cable or wiring.
The front compartment fuse block is located in the front floor console. To access, remove the front floor console bezel. Refer to Floor Console Bezel Replacement in SI.
The rear cargo area fuse block is located under the left rear quarter trim panel. To access, remove the left rear cup holders.