Jetta GLX V6-2.8L (AFP) (2002)
Brake Signal: Testing and Inspection
With Manufacturer's Scan Tool
Brake Light Switch and Brake Pedal Switch Signal, Checking
Special tools and equipment
-
VAG1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
-
VAG1598/31 test box
-
Multimeter (Fluke 83 or equivalent)
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VW1594 adapter set
-
Wiring diagram
Test requirements
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Fuses 5, 10, 13 and 29 OK
-
Battery voltage at least 11.5 V
Test sequence
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Connect VAG1551 (VAG1552) Scan Tool (ST).
-
Switch ignition on and press buttons -0- and -1- to insert "Engine Electronics" address word 01.
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
HELP
Input display group number XXX
-
Press buttons -0-, -6- and -6- to input display group number 66 (066) and press -Q- button to confirm input.
Indicated on display: (1-4 = display fields)
Read Measuring Value Block 66
->
1
2
3
4
-
Observe display in display field 2 (3rd and 4th positions from left):
Specified value: x x 0 0
-
Depress brake pedal and observe display in display field 2.
Specified value: x x 11
-
Press -> button.
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Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
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Switch ignition off.
If the display does not change:
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Disconnect 4-pin harness connector from brake light switch and brake pedal switch.
-
Measure resistance between terminals -1- + -4- of switch.
Specified value with brake pedal not depressed: Infinity ohms
Specified value with brake pedal depressed: max. 1.5 ohms