Check the Supplies and Grounds to the Air Suspension Module

: CHECK THE SUPPLIES AND GROUNDS TO THE AIR SUSPENSION CONTROL MODULE (ASU)

G239843t114 : CHECK THE PERMANENT SUPPLY TO THE ASU
1. Disconnect the ASU electrical connector, CR88.
2. Measure the voltage between CR88, pin 01 (NW) and GROUND.

- Is the voltage less than 10 volts?

-> Yes
REPAIR the circuit between the ASU and battery. This circuit includes the rear power distribution box (fuse 52). TEST the system for normal operation.

-> No

G239843t115 : CHECK THE SWITCHED SYSTEM POWER (SSP) SUPPLY TO THE ASU
1. Make sure the SSP relay is energized.
2. Measure the voltage between CR88, pin 02 (N) and GROUND.

- Is the voltage less than 10 volts?

-> Yes
REPAIR the circuit between the ASU and battery. This circuit includes the rear power distribution box (fuse 12) and the SSP relay. TEST the system for normal operation.

-> No

G239843t116 : CHECK THE GROUND TO THE ASU
1. Measure the resistance between CR88, pin 03 (B) and GROUND.

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. TEST the system for normal operation.

-> No
CHECK for DTCs indicating a network or module fault. REFER to the DTC index.