2009 INFINITI QX56 air suspension

RSU-12
< REMOVAL AND INSTALLATION >
REAR SUSPENSION MEMBER
Rear Load Leveling Air Suspension System
REMOVAL
1. If equipped with rear load leveling air suspension system, use CONSULT-III “EXHAUST SOLENOID”
active test to release the air pressure from the rear load leveling air suspension system.
2. If equipped with the rear load leveling air suspension system, disconnect the electrical connectors for the
height sensor and the rear load leveling air suspension compressor assembly.
3. If equipped with the rear load leveling air suspension system, unclip the rubber cover to access the rear
load leveling air suspension compressor assembly.
1. Seat belt latch anchor 2. Stabilizer bar bushing 3. Stabilizer bar clamp
4. Stabilizer bar 5. Connecting rod 6. Front lower link
7. Knuckle 8. Bushing 9. Rear lower link
10. Shock absorber 11. Suspension arm 12. Lower rubber seat
13. Coil spring 14. Upper rubber seat 15. Rear suspension member
16. Spare tire bracket 17. Bound bumper Front
AWEIA0054GB
1. Rear load leveling air suspension
hose, RH 2. Shock absorber, RH 3. Height sensor
4. Rear load leveling air suspension hose, LH 5. Shock absorber, LH 6. Rear load leveling air suspension
compressor assembly (includes the
bracket and rubber cover)
Front
Revision: December 20092009 QX56

REAR SUSPENSION MEMBERRSU-13
< REMOVAL AND INSTALLATION >
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4. If equipped with the rear load leveling air suspension system, disconnect the rear load leveling air suspension hoses at the
rear load leveling air suspension compressor assembly.
 To disconnect the hoses, push in on the lock ring using a suit-
able tool and pull the hose out.
5. Remove both of the rear wheel and tire assemblies using power tool.
6. Remove the brake caliper without disconnecting the brake hoses, using power tool. Reposition the brake caliper out of the
way using a suitable wire. Refer to BR-36, "Removal and Instal-
lation of Brake Caliper and Disc Rotor".
CAUTION:
 Do not crimp or stretch the brake hose when re positioning the brake caliper out of the way.
 Do not press brake pedal while the brake caliper is removed.
7. Remove the spare tire.
8. Remove both lower shock bolts.
9. Disconnect the two rear ABS sensor electrical connectors.
10. Remove the two rear drive shafts. Refer to RAX-9, "Removal and Installation"
.
11. Remove the rear final drive. Refer to DLN-250, "Removal and Installation"
.
12. Remove the EVAP canister bolt from the top of the rear suspension member.
13. Disconnect the parking brake cables from t he brackets on the rear suspension member.
14. Disconnect parking brake cables at equalizer. Refer to PB-7, "Removal and Installation"
.
15. Set a suitable jack to support each of the rear lower links and the coil spring tension.
16. Remove both of the rear lower link outer bolts and lower the jack to remove the rear coil springs.  If equipped with the rear load leveling air suspension system,
remove the height sensor bracket bolt from the LH lower link.
17. Remove the two bolts to disconnect the seat belt latch anchor from the rear suspension member.
18. Disconnect both of the connecting r ods from the front lower link.
19. Set a suitable jack under the rear suspension member.
20. Remove the six rear suspension member bolts.
21. Slowly lower the jack to remove the rear suspension member, suspension arm, front and rear lower links and stabilizer bar as
an assembly.
22. If necessary, remove the suspension arm, spare tire bracket, height sensor, rear load leveling air suspension hoses, stabilizer
bar, and front and rear lower links from the rear suspension
member.
INSPECTION AFTER REMOVAL
Check rear suspension member for deformation, cracks, and other damage and replace if necessary.
INSTALLATION
Installation is in the reverse order of removal.
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Revision: December 20092009 QX56

RSU-14
< REMOVAL AND INSTALLATION >
REAR SUSPENSION MEMBER
 When raising the rear suspension member assembly, use thelocating pins to align the rear suspension member to the vehicle
body.
 When installing the upper and lower rubber seats for the rear coil springs, the arrow embossed on the rubber seats must point out
toward the wheel and tire assembly.
 To connect the rear load leveling air suspension hoses, the lock ring must be fully seated in the fitt ing. Insert the hose “B” into the
lock ring “A” until the lock ring “A” is touching the hose “B” as
shown. Pull on the hose to check that it is securely inserted.
 Perform final tightening of nuts and bolts for the links (rubber bushing) under unladen condition (unladen condition means that the fuel tank, engine coolant and l ubricants are at the full specification, and the spare
tire, jack, hand tools, and mats are in their designated positions) with the tires on level ground.
 Check the wheel alignment. Refer to RSU-6, "Wheel AlignmentInspection"
LEIA0083E
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LEIA0078E
Revision: December 20092009 QX56

SHOCK ABSORBERRSU-15
< REMOVAL AND INSTALLATION >
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SHOCK ABSORBER
Removal and InstallationINFOID:0000000005889873
REMOVAL
1. Remove the wheel and tire assembly using power tool. Refer to WT-41, "Adjustment".
2. If equipped with the rear load leveling air suspens ion system, use CONSULT-III "EXHAUST SOLENOID"
active test to release the air pressure from the rear load leveling air suspension system.
3. Disconnect the height sensor electrical connector.
4. If equipped with the rear load leveling air suspension system, disconnect the rear load leveling air suspension hose from the
shock absorber.
 To disconnect the hose, push in on the lock ring using a suit-able tool and pull the air hose out.
5. Remove rear wheel fender protector front .
6. Remove the shock absorber upper and lower end bolts using power tool.
7. Remove the shock absorber. CAUTION:
If equipped with the rear lo ad leveling air suspension sys-
tem, do not damage the rubber boot on the shock absorber.
INSTALLATION
Installation is in the reverse order of removal.
 Tighten the shock absorber bolts to specification. Refer to RSU-15, "Removal and Installation"
.
DisposalINFOID:0000000005873208
1. Set shock absorber horizontally with the piston rod fully extended.
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LEIA0082E
Revision: December 20092009 QX56

SUSPENSION ARMRSU-17
< REMOVAL AND INSTALLATION >
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SUSPENSION ARM
Removal and InstallationINFOID:0000000005889874
REMOVAL
1. If equipped with rear load leveling air suspension system, use CONSULT-III “EXHAUST SOLENOID”
active test to release the air pressure from the rear load leveling air suspension system.
2. If equipped with the rear load leveling air suspension system, disconnect the electrical connectors for the
height sensor and the rear load leveling air suspension compressor assembly.
3. If equipped with the rear load leveling air suspension system, unclip the rubber cover to access the rear
load leveling air suspension compressor assembly.
4. If equipped with the rear load leveling air suspension system, disconnect the rear load leveling air suspension hoses at the
rear load leveling air suspension compressor assembly.
 To disconnect the hoses, push in on the lock ring using a suit-able tool and pull the hose out.
5. Remove both of the rear wheel and tire assemblies using power tool.
6. Remove the brake caliper without disconnecting the brake hoses, using power tool. Reposition the brake caliper out of the
way using a suitable wire. Refer to BR-36, "Removal and Instal-
lation of Brake Caliper and Disc Rotor".
CAUTION:
 Do not crimp or stretch the brake hose when re positioning the brake caliper out of the way.
 Do not press brake pedal while the brake caliper is removed.
7. Remove the spare tire.
8. Remove both lower shock bolts.
9. Disconnect the two rear ABS sensor electrical connectors.
10. Remove the two rear drive shafts at t he rear final drive and support drive shafts.
11. Remove the rear final drive. Refer to DLN-250, "Removal and Installation"
.
12. Remove the EVAP canister bolt from the top of the rear suspension member.
13. Disconnect the parking brake cables from t he brackets on the rear suspension member.
14. Disconnect parking brake cables at equalizer. Refer to PB-7, "Removal and Installation"
.
15. Set a suitable jack to support each of the rear lower links and the coil spring tension.
16. Remove both of the rear lower link outer bolts and lower the jack to remove the rear coil springs.  If equipped with the rear load leveling air suspension systemremove the height sensor bracket bolt from the LH rear lower link.
LEIA0074E
LEIA0077E
Revision: December 20092009 QX56

FRONT LOWER LINKRSU-19
< REMOVAL AND INSTALLATION >
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FRONT LOWER LINK
Removal and InstallationINFOID:0000000005889875
REMOVAL
1. Remove the wheel and tire assembly using power tool.
2. If equipped with rear load leveling air suspension system, use CONSULT-III “EXHAUST SOLENOID”
active test to release the air pressure from the rear load leveling air suspension system.
3. Set suitable jack to support rear lower link.
4. Remove the shock absorber lower end bolt.
5. Remove stabilizer bar connecting rod from front lower link.
6. Remove stabilizer bar clamps and place bar aside.
7. Remove the adjusting bolt and nut, and the bolt and nut, from the front lower link and rear suspension member using power
tool.
8. Remove the front lower link pinch bolt and nut on the knuckle side using power tool.
9. Disconnect the front lower link from the knuckle using a soft hammer.
CAUTION:
Do not damage the ball joint or axle boot with the soft ham-
mer.
10. Remove the front lower link.
INSPECTION AFTER REMOVAL
 Check front lower link and bushing for any deformation, crack, or damage. Replace if necessary.
 Check rubber bushing for damage, cracks and deformation. Replace suspension arm assembly if neces-
sary.
 Before checking, turn ball joint at least 10 revo lutions so that ball joint is properly broken in.
LEIA0082E
LEIA0086E
Revision: December 20092009 QX56

REAR LOWER LINK & COIL SPRINGRSU-21
< REMOVAL AND INSTALLATION >
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REAR LOWER LINK & COIL SPRING
Removal and InstallationINFOID:0000000005889876
REMOVAL
1. Remove the wheel and tire assembly using power tool. Refer to WT-41, "Adjustment".
2. If equipped with rear load leveling air suspension system, use CONSULT-III “EXHAUST SOLENOID”
active test to release the air pressure from the rear load leveling air suspension system.
3. If equipped with the rear load leveling air suspension system, for removing the LH rear lower link and coil spring, remove the
height sensor arm bracket bolt from the rear lower link.
4. Remove speed sensor harness and brackets from rear lower link.
5. Set a suitable jack to relieve the coil spring tension and support the rear lower link.
6. Loosen the rear lower link adjusting bolt and nut connected to the rear suspension member, using power tool.
7. Remove the rear lower link bolt and nut from the knuckle using power tool.
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LEIA0077E
LEIA0009E
LEIA0077E
Revision: December 20092009 QX56

RSU-24
< REMOVAL AND INSTALLATION >
REAR LOAD LEVELING AIR SUSPENSION COMPRESSOR ASSEMBLY
REAR LOAD LEVELING AIR SUSPENSION COMPRESSOR ASSEMBLY
Removal and InstallationINFOID:0000000003772299
Rear Load Leveling Air Suspension System
REMOVAL
1. Use CONSULT-III "EXHAUST SOLENOID" active test to release the air pressure from the rear load level-
ing air suspension system.
2. Disconnect the electrical connectors for the rear load leveling air suspension compressor assembly.
3. Unclip the rubber cover to access the rear load leveling air suspension compressor assembly.
4. Disconnect the rear load leveling air suspension hoses at the rear load leveling air suspension compressor assembly.
 To disconnect the hoses, push in on the lock ring using a suit-
able tool and pull the hose out.
AWEIA0054GB
1. Rear load leveling air suspension
hose, RH 2. Shock absorber, RH 3. Height sensor
4. Rear load leveling air suspension hose, LH 5. Shock absorber, LH 6. Rear load leveling air suspension
compressor assembly
Front
LEIA0074E
Revision: December 20092009 QX56