Troubleshooting and Seat System
TROUBLESHOOTINGMake sure battery is fully charged before testing is started. Check and record voltage reading for future reference.
FIGURE 1:
Checking Seat Control System
1. Remove seat.
2. Lay seat on a protected surface near the car.
3. Connect adaptor cable (Special Tool 9269) (Fig. 1) between disconnected wiring harness plugs on car and seat. Terminal 30 (battery plus) and Terminal 31 (ground) can be picked off the 2 pole plug for some test steps. Use a voltmeter to identify + and - terminals.
Do not connect two pin plug to any seat harness plugs.
4. Store a seat position into memory with position key 1.
5. Detach control unit from seat frame and open flap.
Checking Power Supply
6. Disconnect plug 1. Connect Voltmeter (+) to terminal 1 and (-) to terminal 3 in plug receptacle.
Reading: Battery voltage.
If no reading check:
Fuse 21 (Terminal 30) 1987 Model Year Fuse 20 (Terminal 30) 1988 Model Year
If fuses are okay, check wiring.
Connect Voltmeter (+) to Terminal 2 and (-) to Terminal 3.
Switch on ignition.
Reading: Battery voltage.
If no reading check:
Fuse 7 (Terminal 15) 1987 model year Fuse 8 (Terminal 15) 1988 model year.
If fuses are okay check wiring.
Switch off ignition and reconnect plug.
Checking Seat Heating
7. Remove cover of plug 2.
Leave plug connected:
Connect Voltmeter to ground on 2 pole plug of adaptor cable and terminal 1 of plug 2.
Switch on ignition and seat heating.
Reading: Battery voltage.
Switch off seat heating.
Reading: 0 Volt
If readings are not correct, check seat heating switch and wiring.
Switch off ignition.
Checking Potentiometers
8. Disconnect plug 3. Connect Voltmeter (+) to pin 1 and (-) to pin 3 of control unit.
Press position key 1.
Reading: approx. 5 volts
NOTE: Voltage is applied only for approximately 30 to 60 seconds.
9. Connect ohmmeter to plug 3 terminal 1 and terminal 3.
Reading: 2.2-3.2 K ohm
Connect ohmmeter to plug 3 terminal 2 and 3.
Reading: 0-3 K ohms, depending on set position.
10. Check plugs 4 through 8 in exactly the same way as described in steps 8 and 9.
If values are not reached, check wiring.
If okay, replace Potentiometer, Refer to Terminal designation chart on page 3 of this bulletin for plugpotentiometer application.
Checking Memory Switch and Wiring
11. Remove plug cover from plug 9. Leave plug connected.
Connect Voltmeter (+) to terminal 3 and (-) to terminal 5
Press position key 1.
Reading: Battery voltage.
NOTE: Voltage is applied only for approximately 30 to 60 seconds.
Install plug cover and disconnect plug.
Connect Voltmeter (+) to Terminal 1 of plug receptacle and (-) to ground.
Switch on parking lights.
Reading: Battery voltage.
12. Connect ohmmeter to terminal 2 and ground.
Press memory key.
Reading: 0-2 ohm.
Connect ohmmeter to terminal 4 and ground.
Press position key 1.
Reading: 0-1 ohm.
Press position key 2.
Reading: approx. 240 ohm.
Press position key 3.
Reading: approx. 820 ohm.
If values are not reached, check wiring and memory switch.
Checking Seat Switches
13. Disconnect plug 10.
Connect voltmeter to terminal 3 of control unit and plus (+) on 2 pole plug of adaptor cable.
Reading: Battery voltage.
14. Connect ohmmeter to terminal 1 and terminal 3 of plug receptacle.
Press seat switch 1 down.
Reading: 0.0-0.3 ohms.
Connect ohmmeter to terminal 2 and terminal 3.
Press seat switch 1 up.
Reading: 0.0-0.3 ohms.
Connect ohmmeter to terminal 3 and terminal 4.
Press seat switch 1 toward rear.
Reading: 0.0-0.3 ohm.
Connect ohmmeter to terminal 3 and terminal 5.
Press seat switch 1 forward.
Reading: 0.0-0.3 ohms.
If values are not reached, check wiring.
If wiring is okay, replace switch.
15. Check plug 12 for switch 2 and plug 14 for switch 3 exactly the same way as described in step 13 and 14.
Refer to terminal designation chart on page 3 of this bulletin for plug/switch applications.
Checking Relay Units
16. Disconnect plug 11. Connect voltmeter (+) to plus on 2 pole plug of adaptor cable and . . .
a. (-) to terminal 1 of control unit. Press switch 3 up, press switch 2 up, press switch 2 toward rear sequentially.
Reading: Battery voltage in each case.
b. (-) to terminal 2 of control unit. Press switch 3 down, switch 2 down, switch 2 forward sequentially.
Reading: Battery voltage in each case.
c. (-) to terminal 3 of control unit. Press switch 3 up, switch 3 down sequentially.
Reading: Battery voltage in each case.
d. (-) to terminal 4 of control unit. Press switch 2 forward, switch 2 toward rear sequentially.
Reading: Battery voltage in each case.
e. (-) to terminal 5 of control unit. Press switch 2 up, switch 2 down sequentially.
Reading: Battery voltage in each case.
Checking Relay Units (continued)
17. Disconnect plug 13 Connect Voltmeter (+) to plus on 2 pole plug of adaptor cable and . . .
a. (-) to terminal 1 of control unit. Press switch 1 up, switch 1 toward rear, switch 3 forward sequentially.
Reading: Battery voltage in each case.
b. (-) to terminal 2 of control unit. Press switch 1 forward, switch 1 down, switch 3 toward rear sequentially.
Reading: Battery voltage in each case.
c. (-) to terminal 3 of control unit. Press switch 3 forward, switch 3 toward rear sequentially.
Reading: Battery voltage in each case.
d. (-) to terminal 4 of control unit. Press switch 1 forward, switch 1 toward rear sequentially.
Reading: Battery voltage in each case.
e. (-) to terminal 5 of control unit. Press switch 1 up, switch 1 down sequentially, Reading: Battery voltage in each case.
If values are not reached check wiring.
If wiring is okay replace relay unit. Refer to terminal designation chart on page 3 of this bulletin for plug-relay unit application.
Checking Control Unit
18. Remove cover of plug 15.
Leave plug connected.
Connect Voltmeter (-) to ground on 2 pole plug of adaptor cable and (+) to terminal 1 of plug 15.
Press position key 2 or 3 briefly.
Reading: Battery voltage.
Connect Voltmeter to plus (+) on 2 pole plug of adaptor cable and terminal 3 of plug 15.
Reading: Battery voltage
19. Switch on lights.
Connect Voltmeter (-) to ground on 2 pole plug of adaptor cable and (+) to terminal 2 of plug 15.
Press position key 3 and move seat to position stored in memory.
Reading: Approximately 1.8 V
20. Connect Voltmeter (-) to ground on 2 pole plug of adaptor cable and (+) to terminal 4 of plug 15.
Press position key 2 and move seat to position stored in memory.
Reading: approximately 1.8 V
21. Connect Voltmeter (-) to ground on 2 pole plug of adaptor cable and (+) to terminal 5 of plug 15.
Press position key 1 and move seat to position stored in memory.
Reading: approximately 1.8 V
Switch off lights.
If values are not reached check wiring. If wiring is okay replace control unit.