Express 1 Ton Van V8-5.7L VIN R (1999)
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.
1. Remove the component in question.
2. 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.
3. 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.
4. Insert the appropriate adapter from the J 42675 Flat Wire Probe Adapter Kit on the flat wire harness connector in order to test the circuit in
question.
Symptom Diagnostic Example
The following is an example of a symptom and the correct course of action taken by the technician.
IMPORTANT: Research for possible bulletins, DTCs and the vehicle's service history. Also, thoroughly screen the customer regarding the problem in
order to complete the repair of the vehicle and completely satisfy the customer when a DTC or a symptom diagnosis is not available.
Verify the Customer Concern, Check the Problem
Customer complaint is the headlamps are inoperative. Verify the normal operating procedure of the circuit and the components that share that
circuit.
Review the Headlamps Electrical Schematic (Preliminary Checks)
Review the schematic, it is essential to understand how a circuit should work before trying to figure out why it doesn't. After understanding how a
circuit should operate, read the schematic again, this time keeping in mind what has been learned by operating the circuit. Since both the low beam
headlamps are inoperative, ensure that the following components are operating properly.
^
The headlamp Switch.
^
The YEL wire.
^
Low contacts of the Headlamp Dimmer Switch.
^
C100 terminal 1E.
^
The TAN wires.
^
Grounds G105 and G109.
Perform the System Check
The system check indicates that the low beam headlamps operate when the high beam switch is in high. Also, the high beam indicator illuminates
but neither high beam headlamp operates.
Check for Bulletins
Utilizing a combination of Techline tools and the information accumulated from the Preliminary Checks, check for bulletins.
Isolate the Root Cause
At this point analyze and (diagnose the problem), and develop text. Since the high beam indicator illuminated when the headlamp dimmer switch
was in the high position, the high contacts of the headlamp dimmer switch and the LT GRN wire between the headlamp dimmer switch and C100
are good. At this point, it is extremely unlikely that the high beam filaments in the RH and LH headlamps are both open or that both headlamp
connections are bad. The cause must be a bad connection at C100 or an open in the LT GRN wire between C100 and the RH headlamp.
