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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 130 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P0480, P0481, P0691, P0692, P0693, or P0694 >> Test Description

Test Description

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Listen for an audible click when the low speed fan relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  Listen for an audible click when the S/P and high speed fan relays operate. Command both the ON and OFF states. Repeat the commands, as necessary.
DTC P0480, P0481, P0691, P0692, P0693 or P0694

Step Action Yes No
Schematic Reference: Engine Cooling Schematics 
Connector End View Reference: Cooling System Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the Fans Low Speed ON and OFF.
Does the low speed fan relay turn ON and OFF with each command?		 Go to Step 3  Go to Step 4 
3  With a scan tool, command the Fans High Speed ON and OFF.
Do the S/P and the high speed fan relays turn ON and OFF with each command?		 Go to Diagnostic Aids Go to Step 6 
4
  1. Turn OFF the ignition.
  2. Disconnect the low speed fan relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 3 voltage circuit of the low speed fan relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 16 
5
  1. Connect a test lamp between the control circuit of the low speed fan relay and the ignition 3 voltage circuit of the low speed fan relay.
  2. With a scan tool, command the Fans Low Speed ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 12  Go to Step 9 
6
  1. Turn OFF the ignition.
  2. Disconnect the high speed fan relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 3 voltage circuit of the high speed fan relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 7  Go to Step 16 
7
  1. Connect a test lamp between the control circuit of the high speed fan relay and the ignition 3 voltage circuit of the high speed fan relay.
  2. With a scan tool, command the Fans High Speed ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 14  Go to Step 8 
8
  1. Turn OFF the ignition.
  2. Disconnect the S/P fan relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the control circuit of the S/P fan relay and the ignition 3 voltage circuit of the S/P fan relay.
  5. With a scan tool, command the Fans High Speed ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 13  Go to Step 9 
9 Does the test lamp remain illuminated with each command? Go to Step 11  Go to Step 10 
10 Test the control circuit of the appropriate relay for a short to voltage or an open. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 21  Go to Step 15 
11 Test the control circuit of the appropriate relay for a short to ground. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 21  Go to Step 15 
12 Inspect for poor connections at the low speed fan relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 21  Go to Step 17 
13 Inspect for poor connections at the S/P fan relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 21  Go to Step 18 
14 Inspect for poor connections at the high speed fan relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 21  Go to Step 19 
15 Inspect for poor connections at the harness connector of the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 21  Go to Step 20 
16 Repair the ignition 3 voltage circuit for an open or high resistance. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 21  -
17 Replace the low speed fan relay.
Did you complete the repair?		 Go to Step 21  -
18 Replace the S/P fan relay.
Did you complete the repair?		 Go to Step 21  -
19 Replace the high speed fan relay.
Did you complete the repair?		 Go to Step 21  -
20 Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 21  -
21
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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