Case 580SR Service Manual page 940

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3.7 IMMOBILISER CIRCUIT
A. M38 Immobiliser
B. Electronic key socket with LED
C. 2 piece electronic key
D. + 50 to ignition
Wire
No.
1 (+15) Key positive
2 (+30) Permanent + 12 V power supply
3 (-31) Negative power supply
5 - 6 Immobilization relay No. 2
7 - 8 - 9 Immobilization relay No. 1
SECTION 55 - ELECTRICAL SYSTEM
Function
E. Starter motor
F. + 15 key positive
G. Electronic key
Connection
Connected to the + 12 V full ignition supply
Connected to the wire from the battery positive
Connected to the vehicle negative at two independent
points
Connected in line with the wire controlling the starter
motor relay/solenoid - Minimum 500 mA maximum 10 A
capacity
Connect in line with the wire controlling the ignition or
fuel circuit - Minimum 500 mA maximum 10 A capacity
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