Power Outlets Chevrolet Cab & Chassis Silverado 3500

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Auxiliary Power Outlet 120-Volt AC - Exterior (HP2) Connector & Terminal Parts Information

Auxiliary Power Outlet 120-Volt AC - Exterior (HP2) Connector Terminal Identification

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Auxiliary Power Outlet 120-Volt AC - Interior (HP2) Connector & Terminal Parts Information

Auxiliary Power Outlet 120-Volt AC - Interior (HP2) Connector Terminal Identification

Auxiliary Power Outlet 120-Volt AC - Starter/Generator Control Module (SCGM) C5 (HP2)

Auxiliary Power Outlet 120-Volt AC - Starter/Generator Control Module (SCGM) C5 (HP2) Connector & Terminal Parts Information

Auxiliary Power Outlet 120-Volt AC - Starter/Generator Control Module (SCGM) C5 (HP2) Connector Terminal Identification

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Auxiliary Power Outlet - Bin (Y91) Connector & Terminal Parts Information

Auxiliary Power Outlet - Bin (Y91) Connector Terminal Identification

Auxiliary Power Outlet - Console (UQ7)

Auxiliary Power Outlet - Console (UQ7) Connector & Terminal Parts Information

Auxiliary Power Outlet - Console (UQ7) Connector Terminal Identification

Auxiliary Power Outlet - Front (Except Z75)

Auxiliary Power Outlet - Front (Except Z75) Connector & Terminal Parts Information

Auxiliary Power Outlet - Front (Except Z75) Connector Terminal Identification

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Auxiliary Power Outlet Switch (HP2) Connector & Terminal Parts Information

Auxiliary Power Outlet Switch (HP2) Connector Terminal Identification

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Cigar Lighter (Y91 or UQ3/UQ5) Connector & Terminal Parts Information

Cigar Lighter (Y91 or UQ3/UQ5) Connector Terminal Identification

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Cigar Lighter (YE9 w/UQ7) Connector & Terminal Parts Information

Cigar Lighter (YE9 w/UQ7) Connector Terminal Identification

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic System Check will provide the following information

1. The identification of the control modules which command the system
2. The ability of the control modules to communicate through the serial data circuit
3. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Scan Tool Output Controls

Hybrid Control Module (HCM)

Energy Storage Control Module (ESCM)

Starter/Generator Control Module (SGCM)

Scan Tool Data List (W/HP2)

Hybrid Control Module (HCM)

Energy Storage Control Module (ESCM)

Starter/Generator Control Module (SGCM)

Scan Tool Data List (W/O HP2)

Powertrain Control Module (PCM)

PCM - Diesel Engines

Circuit Description

The auxiliary power outlet (APO) switch controls the operation of the hybrid control module (HCM) APO state manager. The APO state manager commands one of 3 states from the starter generator control module (SGCM) (APO Off, APO Normal, APO Continuous). The APO switch is a momentary button, its output signal an input to an HCM analogue channel. Five volts are supplied to the switch and the returned voltage is measured relative to HCM signal ground to determine the switch state. A resistor network in the switch circuitry ensures that shorted high and low states can be diagnosed successfully. There are 2 valid voltage ranges of the return signal, one representing switch open, the other representing switch closed. If the voltage is lower than a threshold, a short low is indicated. Similarly, if the voltage is greater than the short high threshold, a short high is indicated.

DTC Descriptors

This diagnostic procedure supports the following DTCs

1. DTC B3654 Electrical Power Take Off Control Switch Circuit
2. DTC B3655 Electrical Power Take Off Control Switch Circuit Low
3. DTC B3656 Electrical Power Take Off Control Switch Circuit High

Conditions for Running the DTC

1. The ignition is ON.
2. The APO switch is requested ON.

Conditions for Setting the DTC

1. If voltage is lower than a calibrated value, a short low is indicated.
2. If the voltage is greater than a calibrated value the short high is indicated.
3. This DTC is run every 100 ms.

Action Taken When the DTC Sets

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The malfunction indicator lamp (MIL) will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.

Conditions for Clearing the DTC

1. The Conditions for Setting the DTC are no longer present.
2. A history DTC will clear after 40 malfunction-free ignition cycles.
3. The HCM receives the clear code command from the scan tool.

DTC B3654, B3655 or B3656

The starter generator control module (SGCM) uses the interlock circuit to monitor the plugs and connectors for hybrid system function. The interlock indicates the state of the connectors in the 120 voltage circuits. In the SGCM, the primary side of the transformer is connected to a low frequency oscillator circuit. When the loop is complete, the shorted secondary reduces the oscillator voltage, and a comparator senses this as a good and complete interlock loop. If the loop is open, the oscillator amplitude increases and the comparator senses this as a problem.

DTC Descriptor

This diagnostic procedure supports the following DTC

DTC P0A0A High Voltage System Interlock Circuit

The ignition is ON.

1. All conditions met for the vehicle to enter normal or continuous modes.
2. The SGCM run time greater than 5 seconds.

1. The SGCM will record the operating conditions presents when the DTC set as Failure Records data only.
2. The malfunction indicator lamp (MIL) will not illuminate.

1. The Conditions for Setting the DTC are no longer present.
2. A history DTC will clear after 40 malfunction free ignition cycles.
3. The SGCM receives the clear code command from the scan tool.

Diagnostic Aids

Ensure that all connectors are connected properly.

DTC P0A0A

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The auxiliary power outlet (APO) switch controls the operation of the hybrid control module (HCM) APO state manager. The APO state manager commands one of 3 states from the starter generator control module (SGCM), (APO Off, APO Normal, APO Continuous). The APO switch is a momentary button, its output signal an input to an HCM analogue channel. Five volts are supplied to the switch, the returned voltage is measured relative to HCM signal ground to determine the switch state. A resistor network in the switch circuitry ensures that shorted high and low states can be diagnosed successfully. There are 2 valid voltage ranges of the return signal, one representing switch open, the other representing switch closed. If the voltage is lower than a threshold, a short low is indicated. Similarly, if the voltage is greater than the short high threshold, a short 'high' is indicated.

The SGCM uses the interlock circuit to monitor the plugs and connectors for hybrid system function. The interlock indicates the state of the connectors in the 120 voltage circuits. In the SGCM, the primary side of the transformer is connected to a low frequency oscillator circuit. When the loop is complete, the shorted secondary reduces the oscillator voltage, and a comparator senses this as a good and complete interlock loop. If the loop is open, the oscillator amplitude increases and the comparator senses this as a problem. Short Circuits, Overloads and Ground Fault Detection (GFD)

Short Circuits, Overloads and Ground Fault Detection (GFD)

The SGCM monitors ground faults and overloads as well as APO system faults and will disable the APO's when these faults occur. The SGCM tests the ground fault circuit integrity once per ignition cycle and every time the APO is enabled.

The 120-volt AC power outlets are protected against short circuits, overloads and ground faults. If the system detects a short or overloaded circuit, it will immediately shut down the outlets and the light next to the APO button will flash, while at the same time a 120V OVERLOAD or GROUND FAULT message will appear in the DIC. After the fault condition is corrected, the system can be reset by pressing and releasing the APO button. See "APO Operating Mode" for more information on the APO button. Short circuits may occur because a defective extension cord or defective electrical device is plugged into an outlet.

Reference Information

Schematic Reference

Cigar Lighter/Power Outlet Schematics

Connector End View Reference

Power Outlet Connector End Views

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-troubleshooting-diagnosis__wiring-repairs)

Circuit/System Testing

1. With the ignition OFF, Isolate the APO circuit that is inoperative by disconnecting the 120-volt harness (orange) from the energy storage box (ESB) and the SGCM.
2. With a DMM, independently test the APO phase A (hot) and the APO neutral circuits for an open. Also, test the same circuits for a short between each other. Refer to «Cigar Lighter/Power Outlet Schematics»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/body-electrical/#power-outlets) .
3. Test the APO ground circuits for any shorts. As the circuits are normally open.

1. If a defective circuit is found, repair as necessary.
2. If no trouble found with the APO circuits, replace the appropriate APO receptacles.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

120-Volt Accessory Power Receptacle Replacement

Tools Required

J 42059 Cigar Lighter Socket Remover. See Special Tools .

Removal Procedure

1. Remove the power supply fuse.
2. Lift up the front cover of the receptacle.
3. Insert the J 42059 into the receptacle sleeve. See «Special Tools»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/body-electrical/#power-outlets__special-tools) . Tilt the tool so that the tool fits into the slots on the sides of the receptacle sleeve.
4. Hold the plastic ring in place. Pull the receptacle out of the assembly in order to remove the outlet.
5. If J 42059 tool fails to release the power port/lighter socket from the retainer, perform the following alternate method:. See «Special Tools»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/body-electrical/#power-outlets__special-tools) . Insert a small grinding tool with a cutoff wheel into the socket. Remove the plastic latches in the 3 mm (0.11 in) square windows. Use the J 42059 as directed above to remove the socket. See «Special Tools»(/chevrolet/cab-chassis-silverado-3500/2003-2012/remont/body-electrical/#power-outlets__special-tools) .
6. Remove the electrical connector from the socket.

Installation Procedure

1. Insert the plastic ring into the opening and snap the plastic ring into place.
2. Connect the electrical connector to the receptacle.
3. Insert the receptacle through the plastic ring gently by hand until the receptacle ring is sealed.
4. Install the power supply fuse.

120-Volt Accessory Power Receptacle Replacement

1. Disconnect the energy storage box (ESB). Refer to «Hybrid Battery Service Disconnect/Connect (5.3L Engine w/RPO HP2)»(ref-277932-S08030302372008012100000) .
2. Remove the receptacle outlet screws (2).
3. Remove the receptacle outlet (3) from the receptacle box (1).
4. Disconnect the receptacle electrical connections.

1. Connect the receptacle electrical connections.
2. Install the receptacle outlet (3) to the receptacle box (1).
3. Install the receptacle outlet screws (2). Tighten: Tighten the screws to 2 N.m (18 lb in).
4. Connect the ESB. Refer to «Hybrid Battery Service Disconnect/Connect (5.3L Engine w/RPO HP2)»(ref-277932-S08030302372008012100000) .

The Auxiliary Power Outlet (APO) system provides up to 2,400 watts of 120-volt AC power. With these power outlets, you can plug in most auxiliary electrical equipment and devices with a maximum limit of 2,400 watts. If you try to use equipment that requires more than the limit, a 20-amp protection circuit will cut the power supply and a light in the APO switch will flash along with a Driver Information Center (DIC) message that will flash 120V OVERLOAD.

When running APO, do not have the front of the vehicle obstructed. Leave at least five feet (1.5 m) of space between the front of the vehicle and any other object. This will allow airflow through the radiator and help to keep the SGCM cooler.

The power outlets are not designed for equipment with high initial peak starting power of greater than 2,400 watts, such as some air compressors, table saws, etc.

The 120-volt AC power outlets are protected against short circuits, overloads and ground faults. If the system detects a short or overloaded circuit, it will immediately shut down the outlets and the light next to the APO button will flash, while at the same time a 120V OVERLOAD message will appear in the Driver Information Center (DIC). After the fault condition is corrected, the system can be reset by pressing and releasing the APO button. See "APO Operating Mode" for more information on the APO button. Short circuits may occur because a defective extension cord or defective electrical device is plugged into an outlet.

Some electrical devices, such as motor-driven appliances and tools, have high start-up currents. During this start-up period, the 120-volt AC supply will attempt to start the electrical device for up to 5 seconds. If the current does not fall below the maximum 20-amp rating of the APO within this 5-second timeframe, the system will shut down the outlets and the light next to the APO button will flash, while at the same time a 120V OVERLOAD message in the DIC will appear. This type of situation is unlikely, but if it does happen, press the APO button and try to start the electrical device again. If the electrical device fails to start a second time, it is probably because the device needs more start-up power than is available.

The Ground Fault Detection (GFD) system checks for leakage current to ground, or the truck frame, that could potentially be a shock hazard, in much the same way as the Ground Fault Circuit Interrupt (GFCI) outlets protect you in your home. The GFD self-test is automatically performed during the activation of the APO system. Thereafter, if the GFD system detects a significant leakage current, it will immediately shut down the outlets and the light next to the APO button will flash, while at the same time a 120V GROUND FAULT message will appear in the DIC. If this happens, unplug all electrical devices and reset the system by pressing the APO button. Then plug in each electrical device individually until the malfunctioning extension cord or electrical device is identified.

If, after unplugging all electrical devices and cords and resetting the system, either the 120V OVERLOAD message or the 120V GROUND FAULT message continues to be displayed, have the vehicle serviced.

APO Operating Modes

The APO system is capable of being operated in two different modes

1. Normal mode: This is used while the vehicle is running and in PARK (P), the vehicle is in Auto-Stop mode, or the vehicle is moving.
2. Continuous mode: This is used while the vehicle is parked.

Normal Mode

This mode can be activated while in any transmission gear position to supply the outlets with 2,400 watts of 120-volt AC power.

To activate the normal mode do the following

1. Start engine
2. Press the APO button once

If the system stops supplying 120-volt AC power unexpectedly and the APO button starts flashing, the system has detected an overload or ground fault condition. To reset the system see "Resetting the Short Circuit, Overload or Ground Fault Detection (GFD) Circuit" later in this section.

The APO system will operate in the normal mode until you turn it off by doing one of the following

1. Pressing the APO button. The light in the APO button will turn off.
2. Turning the ignition switch to ACCESSORY or LOCK.

Continuous Mode

This mode can be operated only when the vehicle is not moving and the transmission is in PARK (P) and will provide up to 2,400 watts of 120-volt AC power to the outlets. Continuous mode can be operated with the key removed from the ignition. The engine will run continuously in this mode to supply electrical power to the APO system.

To activate the continuous mode, do the following

1. Place the transmission in PARK (P) with the ignition in RUN and the engine running. See "Ignition Positions" in your owner manual Index.
2. Turn the ignition key to LOCK while the light is flashing. The light will flash for up to 30 seconds. When the ignition key has been turned to LOCK, the light next to the APO switch will stop flashing and remain on. The engine will continue to run.
3. Connect any 120-volt AC electrical/electronic device(s) to the outlets. If you must use extension cords, be sure to use only UL® approved extension cords.

You can remove the key from the ignition at this point.

If the system stops supplying 120-volt AC power unexpectedly and the light next to the APO button starts flashing, the system has detected an overload or ground fault condition. To reset the system see "Resetting the Short Circuit, Overload or Ground Fault Detection (GDF) Circuit" later in this section.

The APO system will operate in the continuous mode with the engine running until one of the following occurs

1. You press the APO button. The light in the APO button will turn off and the engine will turn off.
2. If the fuel level gets low. A FUEL LEVEL LOW message will appear in the DIC and the horn will sound intermittently for five seconds every minute for five minutes. If the vehicle is left unattended for the full five minute warning, the engine and APO system will shut down, unless the APO button is pressed during the five minute warning period.
3. An overload or ground fault condition is detected and not reset in five minutes.
4. Vehicle security is violated.
5. Engine oil pressure becomes too low.
6. Engine coolant temperature becomes too hot.
7. The ignition key is moved out of LOCK. This may display a low oil warning message and chimes which is a normal condition when the APO button was not used to shut off the continuous mode.
8. The hybrid power system becomes too hot.

Resetting the Short Circuit, Overload or Ground Fault Detection (GFD) Circuit

To reset the Short Circuit, Overload or Ground Fault Detection (GFD) Circuit while operating in both the normal and continuous modes, ensure any observed fault is removed, and press the APO button. The light next to the button will illuminate indicating that the system is supplying 120-volt AC power to the outlets. In the case of an engine shutdown due to a ground fault while in the continuous mode, restart the engine by turning the key from LOCK to START, then follow the instructions for entering APO Continuous Mode earlier in this section.

For more information on the hybrid system, review the following Description and Operations.

1. «Generator Battery Carrier Description and Operation»(ref-277932-S21773311732008012100000)
2. «Powertrain Control Interface Module Description and Operation»(ref-277905-S26465444342008012100000)
3. «Starter/Generator Description and Operation»(ref-277905-S30542142112008012100000)
4. «Starter/Generator Control Module Description and Operation»(ref-277905-S38073714842008012100000)

Special Tools

Special Tools Illustration Tool Number/ Description J 42059 Cigar Lighter Socket Remover

See also:
• Diagnostic System Check - Vehicle
• Testing for Intermittent Conditions and Poor Connections
• Circuit Testing
• Wiring Repairs
• Control Module References
• Accessory Switch Replacement
• Connector Repairs
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Diagnostic Repair Verification
• Fastener Notice
• DTC B3654, B3655 or B3656
• 120-Volt Accessory Power Receptacle Replacement
• Special Tools