Check Lumbar Support Circuit

CHECK LUMBAR SUPPORT SWITCH
1. Turn ignition switch OFF.
2. Disconnect lumbar support switch connector.
3. Check voltage between lumbar support switch connector B158 terminal 1 and ground.
  1 (R) - Ground: : Battery voltage
OK or NG

OK : GO TO 2.

NG : Repair or replace harness between fuse block (J/B) and lumbar support switch.

Fig 1: Identifying Voltage Between Lumbar Support Switch Connector B158 Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK LUMBAR SUPPORT SWITCH

Lumbar support switch operate, check continuity lumbar support switch connector B158 terminal 31, 32 and 1, 16B.

TERMINAL CONTINUITY CHART

Connector	Terminal		Lumbar support switch condition	Continuity
B158	31	1	BACKWARD	Yes
	31	16B	Other than above	No
	32	1	FORWARD	Yes
	32	16B	Other than above	No

OK or NG

OK : GO TO 3.

NG : Replace lumbar support switch.

Fig 2: Identifying Continuity Lumbar Support Switch Connector B158 Terminal 31, 32 And 1, 16B

G04077759

Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK LUMBAR SUPPORT MOTOR HARNESS
1. Disconnect lumbar support motor connector.
2. Check continuity between lumbar support switch connector B158 terminal 31, 32 and lumbar support motor connector B172 terminal 31, 32.
  31 (W) - 31 (W) : Continuity should exist.
  
  32 (L) - 32 (L) : Continuity should exist.
3. Check continuity between lumbar support switch connector B158 terminal 31, 32 and ground.
  31 (W) - Ground : Continuity should not exist.
  
  32 (L) - Ground : Continuity should not exist.
  
  Fig 3: Identifying Continuity Between Lumbar Support Switch Connector B158 Terminal 31, 32 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK : GO TO 4.

NG : Repair or replace harness between lumbar support switch and lumbar support motor.
CHECK LUMBAR SUPPORT SWITCH GROUND CIRCUIT
Check continuity between lumbar support switch connector B158 terminal 16B and ground.

16B (B) - Ground : Continuity should exist.

OK or NG

OK : Check the condition of the harness and connector.

NG : Repair or replace harness between lumbar support switch and ground.

Fig 4: Identifying Continuity Between Lumbar Support Switch Connector B158 Terminal 16B And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.