For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Cooling Fan System Check performed? | -- | Go to Step 2 | Go to Cooling Fan System Check
2 |

1. Run the engine until operating temperature is reached and the thermostat opens.
2. Stop the engine.
3. Disconnect the fan motor connector.
4. Connect a test lamp across the fan motor connector.
5. Start the engine.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3 | Replace the fan motor. Refer to Engine Cooling Fan Replacement . Is the repair complete? | -- | Go to Cooling Fan System Check | --
4 | Test for an open in the WHT/BLK wire between the fan motor terminal 1 and G103. Is an open present? | -- | Go to Step 21 | Go to Step 5
5 | Test for an open in the BLK/RED wire between the fan motor terminal 2 and the fan no. 1 relay terminal 23. Refer to

#### Fuse and Relay Block 1

(1) | ST Relay
(2) | HEAD Relay
(3) | EFI or F-HTR Relay
(4) | Fuse Puller
(5) | ENGINE MAIN Relay
(6) | HORN Relay
(7) | AM1 Fuse 50A
(8) | RDI Fuse 30A
(9) | FAN Relay
(10) | ALT-S Fuse 7.5A
(11) | Empty
(12) | Not Used
(13) | HORN Fuse 20A
(14) | Not Used
(15) | Not Used
(16) | AM2 Fuse 30A
(17) | HAZARD Fuse 20A
(18) | DOME Fuse 20A
(19) | ALT Fuse 100A
(20) | ABS Fuse 50A
(21) | MAIN Fuse 50A
(22) | Not Used
(23) | Fuse and Relay Block 1

in Wiring Systems.

Is an open present?

--

Go to Step 6

Go to Step 7

6 |

1. Test for an open in the BLK/RED wire between the fan motor terminal 2 and connector 3 terminal 1 of fuse and relay block 1.
2. Test for an open between connector 3 terminal 1 of fuse and relay block 1 and terminal 23 of the fan no. 1 relay. Refer to

   #### Fuse and Relay Block 1

   (1) | ST Relay
   (2) | HEAD Relay
   (3) | EFI or F-HTR Relay
   (4) | Fuse Puller
   (5) | ENGINE MAIN Relay
   (6) | HORN Relay
   (7) | AM1 Fuse 50A
   (8) | RDI Fuse 30A
   (9) | FAN Relay
   (10) | ALT-S Fuse 7.5A
   (11) | Empty
   (12) | Not Used
   (13) | HORN Fuse 20A
   (14) | Not Used
   (15) | Not Used
   (16) | AM2 Fuse 30A
   (17) | HAZARD Fuse 20A
   (18) | DOME Fuse 20A
   (19) | ALT Fuse 100A
   (20) | ABS Fuse 50A
   (21) | MAIN Fuse 50A
   (22) | Not Used
   (23) | Fuse and Relay Block 1

   in Wiring Systems.

Is the BLK/RED wire open?

--

Go to Step 21

Go to Step 16

7 | Test for battery voltage at the fan no. 1 relay terminal 22 with the engine running. Refer to

#### Fuse and Relay Block 1

(1) | ST Relay
(2) | HEAD Relay
(3) | EFI or F-HTR Relay
(4) | Fuse Puller
(5) | ENGINE MAIN Relay
(6) | HORN Relay
(7) | AM1 Fuse 50A
(8) | RDI Fuse 30A
(9) | FAN Relay
(10) | ALT-S Fuse 7.5A
(11) | Empty
(12) | Not Used
(13) | HORN Fuse 20A
(14) | Not Used
(15) | Not Used
(16) | AM2 Fuse 30A
(17) | HAZARD Fuse 20A
(18) | DOME Fuse 20A
(19) | ALT Fuse 100A
(20) | ABS Fuse 50A
(21) | MAIN Fuse 50A
(22) | Not Used
(23) | Fuse and Relay Block 1

in Wiring Systems.

Is battery voltage present?

--

Go to Step 8

Go to Step 10

8 | Test for a short to ground in the BLU/BLK wire between terminal 25 of fuse and relay block 1 and fuse and relay block 2. Is a short to ground present? | -- | Go to Step 21 | Go to Step 9
9 | Test for a short to ground in the LT GRN wire between fuse and relay block 2 and the fan control switch. Is a short to ground present? | -- | Go to Step 21 | Go to Step 17
10 | Test for an open between terminal 22 of the fan no. 1 relay and terminal 14 of the engine main relay in fuse and relay block 1. Is an open present? | -- | Go to Step 16 | Go to Step 11
11 | Test for battery voltage at the ENGINE MAIN relay terminal 16 with the engine running. Refer to

#### Fuse and Relay Block 1

(1) | ST Relay
(2) | HEAD Relay
(3) | EFI or F-HTR Relay
(4) | Fuse Puller
(5) | ENGINE MAIN Relay
(6) | HORN Relay
(7) | AM1 Fuse 50A
(8) | RDI Fuse 30A
(9) | FAN Relay
(10) | ALT-S Fuse 7.5A
(11) | Empty
(12) | Not Used
(13) | HORN Fuse 20A
(14) | Not Used
(15) | Not Used
(16) | AM2 Fuse 30A
(17) | HAZARD Fuse 20A
(18) | DOME Fuse 20A
(19) | ALT Fuse 100A
(20) | ABS Fuse 50A
(21) | MAIN Fuse 50A
(22) | Not Used
(23) | Fuse and Relay Block 1

in Wiring Systems.

Is battery voltage present?

--

Go to Step 13

Go to Step 12

12 | Test for an open in the BLK/YEL wire between fuse and relay block 1 and fuse and relay block 2 OR in the BLK/YEL wire between fuse and relay block 2 and junction block 2. Refer to Wiring Repairs in Wiring Systems. Is an open present? | -- | Go to Step 21 | Go to Step 16
13 | Test for battery voltage at terminal 13 of the ENGINE MAIN relay with the engine running. Is battery voltage present? | -- | Go to Step 15 | Go to Step 14
14 | Test for an open in the WHT wire to connector 4 terminal 2 of fuse and relay block 1. Is an open present? | -- | Go to Step 21 | Go to Step 16
15 | Test for an open in the WHT/BLK wire between fuse and relay block 1 and G103. Is an open present? | -- | Go to Step 21 | Go to Step 20
16 | Replace fuse and relay block 1. Refer to Underhood Fuse Block Replacement in Engine Electrical. Is the repair complete? | -- | Go to Cooling Fan System Check | --
17 | Test the fan control switch. The fan control switch should be closed below 83°C (181°F) and open above 93°C (199°F). Is the fan control switch operating properly? | -- | Go to Step 19 | Go to Step 18
18 | Replace the fan control switch. Refer to Engine Cooling Fan Control Switch Replacement . Is the repair complete? | -- | Go to Cooling Fan System Check | --
19 | Replace the fan no. 1 relay. Refer to Cooling Fan Relay Replacement . Is the repair complete? | -- | Go to Cooling Fan System Check | --
20 | Replace the engine main relay. Refer to Cooling Fan Relay Replacement . Is the repair complete? | -- | Go to Cooling Fan System Check | --
21 | Repair the open/short. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Cooling Fan System Check | --