Lumber Support Circuit Check

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

CHECK LUMBER SUPPORT SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect memory switch and lumber support switch connector.
3. Check voltage between I "memory switch and lumber support switch" connector B316 terminal 33D (R) and ground.
  33D (R) - Ground: Battery voltage
  
  Fig 1: Checking Voltage And Lumber Support Switch Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace harness between fuse block (J/B) and I "memory switch and lumber support switch".

CHECK LUMBER SUPPORT SWITCH

Check voltage between number support switch connector and ground.

VOLTAGE CHECK CHART

Connector	Terminals (Wire color)		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
B314	4 (L)	Ground	Lumber support switch turned to forward	Battery voltage
	4 (L)		Lumber support switch neutral position	0
	5 (W)		Lumber support switch turned to backward	Battery voltage
	5 (W)		Lumber support switch neutral position	0

Fig 2: Checking Voltage Between Number Support Switch Connector And Ground

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

OK or NG

OK: GO TO 3.
NG: Replace power seat switch.

CHECK LUMBER SUPPORT MOTOR HARNESS
1. Disconnect lumber support motor connector.
2. Check continuity between I "memory switch and lumber support switch" connector B314 terminal 4 (L), 5 (W) and lumber support motor connector B315 terminal 4 (L), 5 (W).
  4 (L) - 4 (L): Continuity should exist.
  
  5 (W) - 5 (W): Continuity should exist.
3. Check continuity between l "memory switch and lumber support switch" connector B159 terminal 4 (L), 5 (W) and ground.
  4 (L) - Ground: Continuity should not exist.
  
  5 (W) - Ground: Continuity should not exist.
  
  Fig 3: Checking Continuity Between Lumber Support Switch Connector, And Ground And Lumber Support Motor Connector, And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Repair or replace harness between I "memory switch and lumber support switch" and lumber support motor.
CHECK LUMBER SUPPORT SWITCH GROUND CIRCUIT
Check continuity between lumber support switch connector B306 terminal 48D (B) and ground.

48D (B) - Ground: Continuity should exist.

Fig 4: Checking Continuity Between Lumber Support Switch Connector B306 Terminal 48D (B) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Check the condition of the harness and connector.
2. NG: Repair or replace harness between I "memory switch and lumber support switch" and ground