Battery Usage (Non HP2)
| Base & (HP2/PHT) Underhood | |
|---|---|
| Cold Cranking Amperage (CCA) | 600 A |
| Reserve Capacity Rating | 115 Minutes |
| Replacement Battery Number | 78-6YR |
| Optional (Dual) | |
| Cold Cranking Amperage (CCA) | 770 A |
| Reserve Capacity Rating | 115 Minutes |
| Replacement Battery Number | 78-7YR |
Battery Usage (Non HP2)
Battery Usage (HP2)
| Parallel Hybrid Truck (PHT) (HP2) | |
|---|---|
| GM Part Number | 88986971 |
| Replacement Battery Number | Panasonic HV1255 |
Battery Usage (HP2)
Starter Motor Usage
| Applications | Starter Model |
|---|---|
| 4.3L (L35) 4.8L (LR4) 5.3L (LM7) 5.3L (L59) Methanol | PG-260G |
| 6.0L (LQ4) 8.1L (L18) | PG-260L |
| 6.6L (LB7) Diesel | Hitachi-S14-100B |
Starter Motor Usage
Generator Usage
| Base | |
|---|---|
| Generator Model | Delphi AD230 |
| Rated Output | 102 A |
| Load Test Output | 71 A |
| Optional (Dual) | |
| Generator Model | Delphi AD244 |
| Rated Output | 130 A |
| Load Test Output | 91 A |
| Bosch® Generator | |
| Generator Model | Bosch® 15755900 |
| Rated Output | 130 A |
| Load Test Output | 91 A |
Generator Usage
Energy Storage Box (ESB) Service Disconnect/Connect (5.3L Engine w/RPO HP2)
| CAUTION | To reduce the risk of severe shock and burns, always disconnect the 42 volt (42V) energy storage box (ESB) before doing any work to the ESB system. To disconnect the ESB, turn the engine off and turn OFF the service disconnect switch, which is located on the passenger side of the ESB. |
| CAUTION | To reduce the risk of severe shock and burns, disable the 42 volt (42V) system anytime you perform service work on or around the energy storage box (ESB). The 42V system will still be active after you have disabled the ESB. |
| CAUTION | To reduce the risk of severe shock and burns, always treat the 3-phase cable and connectors as if voltage is present and as if the surface of all parts of the cable is hot. |
Disconnect Procedure
- Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (Single Battery)»(ref-184144-S12006988322005082200000) or «Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery)»(ref-184144-S01033869922005082200000) .
- Open the rear door.
- Remove the energy storage box (ESB) access panel.
- Rotate the battery disconnect key to the horizontal position.
- Raise the rear seat.
- Remove the plastic retainers from the ESB trim cover (1).
- Remove the ESB trim cover.
- Disconnect the 42-volt positive/negative cable electrical connector (4).
Connect Procedure
- Connect the 42-volt positive/negative cable electrical connector (4).
- Install the ESB trim cover.
- Install the plastic retainers to the ESB trim cover (1).
- Lower the rear seat.
- Rotate the battery disconnect key to the vertical position.
- Install the ESB access panel.
- Close the rear door.
- Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure (Single Battery)»(ref-184144-S12006988322005082200000) or «Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery)»(ref-184144-S01033869922005082200000) .
Battery Ratings
A battery has 2 ratings
- Reserve capacity
- Cold cranking amperage
When a battery is replaced, use a battery with similar ratings. Refer to the battery specification label on the original battery or refer to Battery Usage (Non HP2) or Battery Usage (HP2) .
Cold Cranking Amperage
The cold cranking amperage is an indication of the ability of the battery to crank the engine at cold temperatures. The cold cranking amperage is the minimum amperage necessary to maintain 7.2 volts for 30 seconds at -18°C (0°F). Refer to Battery Usage (Non HP2) or Battery Usage (HP2) for the cold cranking amperage rating for this vehicle.
Auxiliary Battery
Auxiliary batteries are an available option on vehicles where many accessories can be utilized such as TVs, radios, lights, computers, etc. The charging of these batteries is explained in charging system description and operation. Also, the auxiliary battery is only for accessory use and not part of the starting system.
Generator
The AD-230 and AD-244 generators are non-repairable. They are electrically similar to earlier models. The generators feature the following major components
- The delta stator
- The rectifier bridge
- The rotor with slip rings and brushes
- A conventional pulley
- Dual internal fans
- A voltage regulator
The pulley and the fan cool the slip ring and the frame.
The AD stands for air-cooled dual internal fan; the 2 is an electrical design designator; the 30/44 denotes the outside diameter of the stator laminations in millimeters, over 100 millimeters. The generators is rated at 102 and 130 amperes respectively.
The generator features permanently lubricated bearings. Service should only include the tightening of mounting components. Otherwise, the generator is replaced as a complete unit.
Regulator
The voltage regulator controls the field current of the rotor in order to limit system voltage. The regulator switches the current ON and OFF at a rate of 400 cycles per second in order to perform the following functions
- Radio noise control
- Obtain the correct average current needed for proper system voltage control
At high speeds, the on-time may be 10 percent with the off-time at 90 percent. At low speeds, the on-time may be 90 percent and the off-time 10 percent.
Auxiliary Battery Charging
The auxiliary battery is charged in the same manner as the primary battery with the ignition switch in the run position and the engine running. The system contains the following components
- Auxiliary battery.
- Auxiliary battery relay.
- Mega fuse.
- Junction block battery cable.
- Associated wiring.
The auxiliary battery relay coil is energized with the engine running through the fuse block and wiring, thus closing the relay contacts which allow the battery to be charged from the vehicle's generator via the battery junction block. The auxiliary battery relay is permanently grounded so any time the ignition switch is in the run position the relay will be energized.
The auxiliary battery is only used for accessories and is not part of the vehicle starting system. However if the primary battery fails and in need of an jump start, follow the service information for Jump Starting In Case Of Emergency using appropriate battery jumper cables.
Charging System Indicator
The IPC illuminates the charge indicator in the message center when the following occurs
- The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.
- The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.
- The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
- The ignition is on, with the engine off.
Energy Storage Box (ESB)
The energy storage box (ESB) subsystem provides the capability to store electrical energy as chemical energy to provide the energy required by the Energy Management System. The ESB shall monitor the energy exchange along the 42-volt bus internal to the ESB and to provide status information to the hybrid control module (HCM). The 3 valve-regulated lead-acid batteries provide power for the 42-volt system. The "deep cycle" batteries employ Absorbent Glass Mat technology, specifically designed for hybrid vehicles, and are tailored to GM performance requirements. Lead-acid batteries are less costly to replace than nickel-metal hydride batteries or other battery technologies. They have a 50 to 55 amp hour Ahr. capacity and a projected 4-year life. The batteries are stored in a single energy storage module mounted under the rear seat. They power the electro-hydraulic power steering (EHPS) and the starter/generator. A conventional under-hood battery powers all the other electrical items, like the lighting, the driver information center (DIC) and the Infotainment system. The ESB physical content as follows
- 3-Panasonic HV1255V valve regulated lead acid batteries, wired in series.
- Energy storage control module (ESCM)
- Service disconnect switch
- 2-120 V AC duplex outlet
- Battery module vent tubing system
- 42-volt bus fuse
- 12-volt ventilation fan and outlet duct
- Current sensor
- 42-volt harness and connector
- 12-volt connector and harness
- 120 V AC connector and harness
The ESB functional content as follows
- Store electrical energy into chemical energy
- Receive 42-volt DC energy via the 42-volt bus for charging
- Determine appropriate power mode
- Monitor and calculates energy transfer and status
- Monitor temperature of batteries
- Monitor and control fan speed.
- Monitor and control the battery cut-off (BCO) switch.
- Provide an outlet interface to HVAC ventilation duct
- Provide removal of battery gases
- Provide a side impact 42-volt auto disconnect
- Communicate faults/information via LAN messages
| IMPORTANT | The Panasonic HV1255 VRLA batteries used in service will have approximately 80 percent state of charge (SOC) when shipped from the manufacture. BEFORE battery replacement, both the battery pack and faulty battery must be fully charged at the pack level (together) to ensure the vehicle battery pack will be equally balanced and charged. The new replacement battery will be charged to 100 percent SOC using the J 42634 Battery Module Charger before installation. Refer to Battery Charging (Non-HP2) or Battery Charging (HP2) . The Service Charge Procedure MUST be performed at the pack level if: The vehicle is not operated for a period of time. The energy storage box (ESB) battery pack is less than 45 percent SOC. One or more batteries are diagnosed for replacement. Service Charge Procedure: Install a scan tool. Service Disconnect in the ON position. Connect a MANUAL battery charger to the underhood battery positive remote jumper stud refer to and to engine ground. Turn on the battery charger and set to 40-amp setting. Turn ON the ignition. Select the SGCM Service Charge Procedure from Special Functions/SGCM Output Controls and select ON. Turn OFF the ignition and disconnect the scan tool. The starter/generator control module (SGCM) will continue the charging process and control the charging rate with the scan tool disconnected and the ignition off. The SGCM monitors the battery pack and will stop the Service Charge Procedure when 100 percent SOC is met. The battery charger will display a low current output when the process is complete and without battery damage. Base voltage for 100 percent SOC is +/-0.2 volts from 13 volts. The procedure is completed in 4-5 hours maximum. The Panasonic batteries are designed to have a life span of approximately 62,000 amp hours. If all 3 batteries are replaced, the total Ahrs. must be reset with a scan tool, through BECM Output Controls. Individual Battery Charging: Replacement of one or more batteries require a unique charging procedure that must be followed for proper vehicle service. Refer to Battery Charging (Non-HP2) or Battery Charging (HP2) . |
Hybrid Control Module (HCM)
The hybrid control module (HCM) is located on the engine fan shroud near the powertrain control module (PCM). It acts as a gateway between the high-speed GMLAN and Class 2 local area networks. If a module in the high-speed system needs to pass information to the Class II bus, it tags that message and passes it on to the HCM; the HCM reads the message and passes it along to the appropriate network. For example, if the starter generator control module (SGCM) needs to display a warning or alert the driver to a change in operating mode, the HCM would take that message from the high speed link and pass it to the display controller, which is on the Class II system. The HCM also
- Controls automatic engine starts and stops
- Controls the energy flowing into/out of the 14-volt and 42-volt batteries
- Enables and disables power for the auxiliary power outlets
- Enables and disables surge smoothing/active damping
- Disables energy generation after airbag deployment
- Controls the auxiliary transmission pump, the power maintenance relay, and the auxiliary heater pump
- Controls starter generator speed during transmission downshift assists-The downshift assists support the engine during un-fueled downshifts from 4th to 3rd gear and 3rd to 2nd gear. The HCM calculates a target engine speed and uses the starter generator to maintain that target. The starter generator has to control engine speed, using a torque command, which is within the upper and lower torque limits specified by the HCM.
Starter/Generator
Instead of a conventional starter motor and generator, the PHT uses a compact 14-kW electric induction motor or starter generator integrated in a patented, space-efficient manner between the engine and transmission. The starter generator provides fast, quiet starting power and allows automatic engine stops and starts to conserve fuel. It also smooths out any driveline surges, generates electrical current to charge the batteries, runs auxiliary power outlets, and provides coast-down regenerative braking as an aid to fuel economy. The starter generator includes a rotor and stationary stator, housed inside the transmission bell housing.
The stator is attached to the engine block and incorporates high efficiency/smaller package size coils formed by laser welding copper bars together instead of winding with copper wire. The rotor bolts directly to the engine crankshaft and spins inside the stator. Current flowing through the stator's electric windings generates magnetic forces in the rotor, which causes the rotor to turn, starting the engine. The starter generator is in series with the engine, connected directly to it, so that anytime the engine is turning, the Starter Generator is turning and vice versa. An auxiliary transmission oil pump helps enable the automatic start feature by assuring sufficient line pressure to allow torque transfer immediately upon driver command, when the engine is started.