Grand Voyager L4-2.4L DOHC (1996)
Air Bag Control Module: Description and Operation
AIR BAG CONTROL MODULE (ACM)
The ACM/Air Bag System Diagnostic Module (ASDM) contains safing sensor and energy reserve capacitor, while the ACM/Air Bag Electronic
Control Module (AECM) contains impact sensor and energy reserve capacitor. The ACM monitors system to determine system readiness. The
ACM will store sufficient energy to deploy air bag for two minutes after battery has been disconnected. The ACM contains an on board
diagnostics function that will illuminate air bag warning lamp when a system fault occurs.
CIRCUIT OPERATION
Two different circuits supply battery voltage to the Airbag Control Module (ACM), they are F14 and F23. Different circuits from the Power
Distribution Center (PDC) and the ignition switch supply battery voltage to the junction block bus bars.
The F23 circuit supplies battery voltage to the ACM only when the ignition switch is in the RUN position. The F14 circuit powers the ACM when
the ignition switch is in either the START or RUN position.
A bus bar internal to the ignition switch connects the A2 circuit from the junction block to the A22 circuit when the switch is in the RUN position.
The A22 circuit supplies battery voltage to the PDC fuse that feeds the F23 circuit. A 10 Amp fuse in the junction block, cavity 8, protects the A2
and A22 circuits. A 10 Amp fuse in cavity 27 of the PDC protects the F23 circuit.
When the ignition switch is in the START/RUN position, it connects the A1 circuit from the PDC to the F87 circuit. The F87 circuit supplies
battery voltage to the junction block bus bar that feeds the F14 circuit. A 40 Amp fuse in cavity 5 of the PDC protects the A1 and F87 circuits. A
10 Amp fuse in cavity 27 of the PDC protects the F23 circuit.
The ACM has a case ground, and an external dedicated ground, circuit Z2. The dedicated ground connects to the ACM bracket.
