Starting System: Other — Chevrolet Silverado 1500 HD (2001-2006)

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. See INTERMITTENT OR POOR CONNECTIONS .

CHECKING AFTERMARKET ACCESSORIES

WARNING

When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to the following procedures first. For Utility vehicle, see DISABLING & ACTIVATING AIR BAG SYSTEM . For Pickup vehicles, see DISABLING & ACTIVATING AIR BAG SYSTEM . Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

CAUTION

The OBD II symbol is used on the wiring diagrams in order to alert the technician that the circuit is essential for proper OBD II emission control circuit operation. Any circuit which fails and causes the Malfunction Indicator Light (MIL) to turn on, or causes emissions-related component damage, is identified as an OBD II circuit.

DO NOT connect aftermarket accessories into the following circuits

SIR circuits, all such circuits are indicated on wiring diagrams with the SIR symbol.
OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.

Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.

Possible causes of vehicle problems related to aftermarket accessories include

Power feeds connected to points other than the battery.
Antenna location.
Transceiver wiring located too close to vehicle electronic modules or wiring.
Poor shielding or poor connectors on antenna feed line.
Check for recent Technical Service Bulletins (TSB) detailing installation guidelines for aftermarket accessories.

INTERMITTENT OR POOR CONNECTIONS

Note. Tools Required: GM-Approved Terminal Test Kit (J-35616-C) Terminal Repair Kit (J-38125-D), Instruction Manual (J-38125-4) and Flat-Wire Probe Adapter (J-42675).

Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items

Wiring broken inside the insulation.
Poor connection between the male and female terminal at a connector.
Poor terminal to wire connection. Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself and corrosion in the wire to terminal contact area, etc.
Wire insulation which is rubbed through. This causes an intermittent short as the bare area touches other wiring or parts of the vehicle.

Round Wire Connectors

Follow the procedure to test terminal contact of Metri-Pack or 56 series terminals. Refer to the terminal repair kit or the instruction manual for terminal identification. Follow the procedure in order to test terminal contact.

Separate the connector halves.
Visually inspect the connector halves for contamination. Contamination may result in a White or Green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety: terminals, seals, and connector body.
Using an equivalent male terminal from the terminal repair kit, test that the retention force is significantly different between a good terminal and a suspect terminal. Replace the female terminal in question.

Flat Wire (Dock & Lock) Connectors

There are no serviceable parts for flat wire (dock and lock) connectors on the harness side or the component side. Follow the procedure below in order to test terminal contact.

Remove the component in question.
Visually inspect each side of the connector for signs of contamination. Avoid touching either side of the connector as oil from your skin may be a source of contamination as well.
Visually inspect the terminal bearing surfaces of the flat wire circuits for splits, cracks, or other imperfections that could cause poor terminal contact. Visually inspect the component side connector to ensure that all of the terminals are uniform and free of damage or deformation.
Insert the appropriate adapter from the flat-wire probe adapter on the flat wire harness connector in order to test the circuit in question.

STARTER SOLENOID DOES NOT CLICK

Refer to illustrations for STARTER SOLENOID DOES NOT CLICK symptom test. (Scheme 5)- (Scheme 8).

Scheme 5

Scheme 5: STARTER SOLENOID DOES NOT CLICK

Scheme 6

Scheme 7

Scheme 8

STARTER SOLENOID CLICKS, ENGINE DOES NOT CRANK

Refer to illustration for STARTER SOLENOID CLICKS, ENGINE DOES NOT CRANK symptom test. (Scheme 9)

Scheme 9

Scheme 9: STARTER SOLENOID CLICKS, ENGINE DOES NOT CRANK

ENGINE CRANKS SLOWLY

Perform the following checks

Battery - See «BATTERY TESTING & INSPECTION (NON-HP2)»(ref-168656-S21569413602004111300000) .
Wiring - Inspect the wiring for damage. Inspect all connections to the starter motor, solenoid, battery, and all ground connections. See «INTERMITTENT OR POOR CONNECTIONS»(ref-168656-S00901907112004111300000) .
Engine - Make sure the engine is not seized. See «GASOLINE ENGINE - MECHANICAL TROUBLE SHOOTING»(ref-27342-S03731861042001112800000) .

If the battery, the wiring and the engine are functioning properly and the engine continues to crank slowly, replace the starter motor. See

STARTER MOTOR

Refer to appropriate link below for removal and installation of starter motor.

«Pickup (4.3L Engine)»(ref-168656-S27544643772004111600000)
«Pickup (4.8L, 5.3L & 6.0L Engines)»(ref-168656-S37628616252004111600000)
«Pickup (6.6L Diesel Engine)»(ref-168656-S27126478952004111600000)
«Pickup (8.1L Engine)»(ref-168656-S09901787102004111600000)
«Sport Utility (4.8L, 5.3L, 6.0L & 8.1L Engines)»(ref-168656-S37836072942004111500000)