Infiniti G20 (P11). Manual — part 412
MGI035A
Input-output voltage chart
Pin No.
Item
Condition
Voltage
value V
In case of high resistance such as single strand V*
1
Lamp
Switch ON
Approx. 0
Battery voltage (Inoperative lamp)
Switch OFF
Battery voltage
Battery voltage
2
Switch
Switch ON
Approx. 0
Higher than 0 Approx. 4 (Example)
Switch OFF
Approx. 5
Approx. 5
The voltage value is based on the body ground.
* : If high resistance exists in the switch side circuit (caused by a single strand), terminal 2 does not detect approx. 0V. Control unit
does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not control ground to light up the
lamp.
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT
Circuit Inspection (Cont’d)
GI-33
NCGI0006
NOTICE:
Trouble diagnoses indicates work procedures required to diagnose
problems effectively. Observe the following instructions before
diagnosing.
1)
Before performing trouble diagnoses, read the “Prelimi-
nary Check”, the “Symptom Chart” or the “Work Flow”.
2)
After repairs, re-check that the problem has been com-
pletely eliminated.
3)
Refer to Component Parts and Harness Connector Loca-
tion for the Systems described in each section for
identification/location of components and harness con-
nectors.
4)
Refer to the Circuit Diagram for quick pinpoint check.
If you need to check circuit continuity between harness
connectors in more detail, such as when a sub-harness is
used, refer to Wiring Diagram in each individual section
and Harness Layout in EL section for identification of har-
ness connectors.
5)
When checking circuit continuity, ignition switch should
be OFF.
6)
Before checking voltage at connectors, check battery volt-
age.
7)
After accomplishing the Diagnostic Procedures and Elec-
trical Components Inspection, make sure that all harness
connectors are reconnected as they were.
HOW TO FOLLOW TROUBLE DIAGNOSES
GI-34
How to Follow Test Groups in Trouble
Diagnoses
NCGI0006S01
SGI138AA
1)
Work and diagnostic procedure
Start to diagnose a problem using procedures indicated in
enclosed test groups.
2)
Questions and required results.
Questions and required results are indicated in bold type in test
group.
The meaning of results are as follows:
a. Battery voltage
→
11 - 14V or approximately 12V
b. Voltage: Approximately 0V
→
Less than 1V
3)
Symbol used in illustration
Symbols included in illustrations refer to measurements or pro-
cedures. Before diagnosing a problem, familiarize yourself with
each symbol. Refer to “CONNECTOR SYMBOLS” (GI-16) and
“Key to Symbols Signifying Measurements or Procedures” (GI-
37).
4)
Action items
Next action for each test group is indicated based on result of
each question. Test group number is shown in the left upper
portion of each test group.
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HOW TO FOLLOW TROUBLE DIAGNOSES
How to Follow Test Groups in Trouble Diagnoses
GI-35
AGI070
Harness Wire Color and Connector Number
Indication
NCGI0006S03
There are two types of harness wire color and connector number
indication.
TYPE 1: HARNESS WIRE COLOR AND CONNECTOR
NUMBER ARE SHOWN IN ILLUSTRATION
NCGI0006S0301
I
Letter designations next to test meter probe indicate harness
wire color.
I
Connector numbers in a single circle (e.g. M33) indicate har-
ness connectors.
I
Connector numbers in a double circle (e.g. F211) indicate com-
ponent connectors.
TYPE 2: HARNESS WIRE COLOR AND CONNECTOR
NUMBER ARE SHOWN IN TEXT
NCGI0006S0302
SGI144A
HOW TO FOLLOW TROUBLE DIAGNOSES
Harness Wire Color and Connector Number Indication
GI-36
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