Introduction
Component testing procedures are provided to determine whether a component is good or bad.
Testing information for each component includes a schematic, a view of the terminal locations and step-by-step test procedures.
Terminal locations are identified by numbers or letters that may be on the component or next to it.
Scheme 1
The component connector MUST BE REMOVED before testing. To test a single circuit within the component, select that circuit under the column "Circuit to test". If you wish to test the complete component, perform all tests.
Connect the tester to the terminals shown in the second column and operate the component as shown in the third column.
Scheme 2
Scheme 3
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Headlamps | 3 and 7 | Off | Open circuit |
| Park | Open circuit | ||
| Head | Closed circuit | ||
| Park lamps | 2 and 3 | Off | Open circuit |
| Park | Closed circuit | ||
| Head | Open circuit | ||
| Off | 3 and 6 | Off | Closed circuit |
| Park | Open circuit | ||
| Head | Open circuit |
HEADLAMP SWITCH COMPONENT TESTING
Scheme 4
Scheme 5
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Interior lamps circuit | 4 and 2 | Off | Open circuit |
| Dome | Closed circuit | ||
| Illumination dimmer resistor | 4 and 1 | Rotate knob | Ohmmeter will show smoothly increasing/decreasing resistance |
ILLUMINATION DIMMER SWITCH COMPONENT TESTING
Scheme 6
Scheme 7
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move key to these positions | A good switch will indicate |
|---|---|---|---|
| Run/Accessory power circuit | 7 and 3 | Accessory | Closed circuit |
| Lock/Off/Run/Start | Open circuit | ||
| 9 and 3 | Accessory/Lock/Off | Open circuit | |
| Run | Closed circuit | ||
| Start | Open circuit | ||
| Run power circuit | 2 and 8 12 and 13 | Accessory/Lock/Off | Open circuit |
| Run | Closed circuit | ||
| Start | Open circuit | ||
| Run/Start power circuit | 7 and 1 | Accessory/Lock/Off | Open circuit |
| Run/Start | Closed circuit | ||
| Start power circuit | 2 and 5 | Accessory/Lock/Off/Run | Open circuit |
| Start | Closed circuit |
IGNITION SWITCH COMPONENT TESTING
Scheme 8
Scheme 9
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Off | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Off/Mist | Open at all cavities. |
| Int 1 | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Int 1 | Closed at cavity 4, open at all other cavities |
| Int 2 | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Int 2 | Closed at cavities 3 and 4, open at all other cavities |
| Int 3 | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Int 3 | Closed at cavity 3, open at all other cavities. |
| Int 4 | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Int 4 | Closed at cavities 3 and 6, open at all other cavities. |
| Int 5 | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Int 5 | Closed at cavity 6, open at all other cavities. |
| Low | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Low | Closed at cavities 4 and 6, open at all other cavities. |
| High | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | High | Closed at cavities 1, 4, and 6, open at all other cavities. |
| Wash-w/CKT 680 | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Wash | Closed at cavity 2, open at cavity 1, any state at other cavities. |
| Wash-w/o CKT 680 | C202C cavity 5 and C202C cavities 1, 2, 3, 4, and 6 | Wash | Closed at cavities 3, 4, and 6, open at all other cavities. |
MULTIFUNCTION SWITCH COMPONENT TESTING
Scheme 10
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Turn signal | From C202A cavity 1 to C202A cavity 2 | Hazard switch to Normal (Off) and Turn switch to Left | Closed circuit |
| From C202A cavity 1 to C202A cavity 3 | Hazard switch to Normal (Off) and Turn switch to Right | Closed circuit | |
| Hazard | From C202A cavity 10 to C202A cavity 6 | Hazard switch to Hazard (On) (Button pushed in and then released to fully extended position) | Closed circuit |
| Flash-to-pass | From C202B cavity 11 to cavity 10 | Pull and hold lever stalk toward steering wheel | Closed circuit |
| High beam | From C202B cavity 9 to C202B cavity 10 | Lever stalk in detent away from steering wheel | Closed circuit |
| Low beam | From C202B cavity 9 to C202B cavity 10 and from C202B cavity 11 to C202B cavity 10 | Lever stalk in neutral position toward steering wheel | Open circuit |
MULTIFUNCTION SWITCH COMPONENT TESTING
Scheme 11
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Power and Ground Checks Before Any Other Tests | 7 and 1 7 and 3 7 and 5 7 and 8 | All window switches - at rest | Open circuit |
| 2 and 1 2 and 3 2 and 5 2 and 8 | All window switches - at rest | Closed circuit | |
| Left front window circuit | 7 and 5 | Up | Closed circuit |
| 7 and 1 | Down | Open circuit | |
| Right front window circuit | 7 and 8 | Up | Closed circuit |
| 7 and 3 | Down | Closed circuit |
MASTER WINDOW ADJUST SWITCH COMPONENT TESTING
Scheme 12
Scheme 13
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Lock Switch Circuit | 1 and 4 | Lock | Closed circuit |
| 3 and 4 | Lock | Open circuit | |
| Rest | Open circuit | ||
| Unlock Switch Circuit | 3 and 4 | Unlock | Closed circuit |
| 1 and 4 | Unlock | Open circuit | |
| Rest | Open circuit |
DOOR LOCK SWITCH, DRIVER SIDE COMPONENT TESTING
Scheme 14
Scheme 15
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Up Switch Circuit | 5 and 3 | Up | Closed circuit |
| 1 and 2 | Up | Closed circuit | |
| Rest | Closed circuit | ||
| Down Switch Circuit | 2 and 3 | Down | Closed circuit |
| 5 and 6 | Down | Closed circuit | |
| Rest | Closed circuit |
WINDOW ADJUST SWITCH, PASSENGER SIDE COMPONENT TESTING
Scheme 16
Scheme 17
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Lock Switch Circuit | 1 and 4 | Lock | Closed circuit |
| 3 and 4 | Lock | Open circuit | |
| Rest | Open circuit | ||
| Unlock Switch Circuit | 3 and 4 | Unlock | Closed circuit |
| 1 and 4 | Unlock | Open circuit | |
| Rest | Open circuit |
DOOR LOCK SWITCH, PASSENGER SIDE COMPONENT TESTING
Scheme 18
Scheme 19
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Lock Switch Circuit | 2 and 4 | Lock | Closed circuit |
| 6 and 4 | Lock | Open circuit | |
| Rest | Open circuit | ||
| Unlock Switch Circuit | 6 and 4 | Unlock | Closed circuit |
| 2 and 4 | Unlock | Open circuit | |
| Rest | Open circuit |
DOOR LOCK SWITCH, REAR DOORS COMPONENT TESTING
Scheme 20
Scheme 21
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Power and Ground Checks Before Any Other Tests | 4 and 2 | Rest | Open circuit |
| 4 and all others except 2 | Rest | Closed circuit | |
| Front up/down circuit | 5 and 2 | Up | Closed circuit |
| 7 and 2 | Down | Closed circuit | |
| Rear up/down circuit | 6 and 2 | Up | Closed circuit |
| 1 and 2 | Down | Closed circuit | |
| Entire seat circuit | 3 and 2 | Rearward | Closed circuit |
| 8 and 2 | Forward | Closed circuit | |
| 1 and 2 7 and 2 | Down | Closed circuit | |
| 5 and 2 6 and 2 | Up | Closed circuit |
SEAT CONTROL SWITCH, DRIVER SIDE FRONT COMPONENT TESTING
Scheme 22
Scheme 23
Scheme 24
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Left mirror | Selector switch Left | ||
| Up | 3 and 5 6 and 1 | Up | Closed circuit |
| Down | 3 and 6 5 and 1 | Down | Closed circuit |
| Left | 3 and 6 8 and 1 | Left | Closed circuit |
| Right | 3 and 8 6 and 1 | Right | Closed circuit |
| Right mirror | Selector switch Right | ||
| Up | 3 and 2 6 and 1 | Up | Closed circuit |
| Down | 3 and 6 2 and 1 | Down | Closed circuit |
| Left | 3 and 6 7 and 1 | Left | Closed circuit |
| Right | 3 and 7 6 and 1 | Right | Closed circuit |
EXTERIOR REAR VIEW MIRROR SWITCH COMPONENT TESTING
Scheme 25
Scheme 26
Scheme 27
| Circuit to test | Connect ohmmeter to terminals | A good relay will indicate |
|---|---|---|
| Coil | 85 and 86 | 46 - 90 ohms |
| Contact | 30 and 87A | Closed circuit |
| 30 and 87 | Open circuit | |
| Coil - Contact | 86 and 30 | Open circuit |
| 86 and 87A | Open circuit | |
| 86 and 87 | Open circuit |
RELAY - MINI ISO COMPONENT TESTING
Disconnect the ohmmeter and connect pins 30 and 85 to 12V DC power and pin 86 to ground. Measure voltage between pins 87 and 86. If the voltage is 12V, continue with the test. If not, replace the relay. Disconnect power from pin 85 and measure voltage between pins 87A and 86. If the voltage is 12V, the relay is okay. If not, replace the relay.
Scheme 28
Scheme 29
| Circuit to test | Connect ohmmeter to terminals | A good relay will indicate |
|---|---|---|
| Coil | 1 and 2 | 63 - 120 ohms |
| Contact | 3 and 4 | Closed circuit |
| 3 and 5 | Open circuit | |
| Coil - Contact | 1 and 3 | Open circuit |
| 1 and 4 | Open circuit | |
| 1 and 5 | Open circuit |
RELAY - MICRO ISO COMPONENT TESTING
Disconnect the ohmmeter and connect pins 2 and 3 to 12V DC power and pin 1 to ground. Measure voltage between pins 5 and 1. If the voltage is 12V, continue with the test. If not, replace the relay. Disconnect power from pin 2 and measure voltage between pins 4 and 1. If the voltage is 12V, the relay is okay. If not, replace the relay.
Scheme 30
Scheme 31
| Circuit to test | Connect ohmmeter to terminals | A good relay will indicate |
|---|---|---|
| Coil | 85 and 86 | 50 - 100 ohms |
| Contact | 30 and 87 | Open circuit |
| Coil - Contact | 86 and 30 | Open circuit |
| 86 and 87 | Open circuit |
RELAY - MINI ISO COMPONENT TESTING
Disconnect the ohmmeter, connect pins 30 and 85 to 12V DC power and pin 86 to ground. Measure voltage between pin 87 and pin 86. If the voltage is 12V, the relay is okay. If not, replace the relay.