Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Depress the horn switch.

Do the horns operate?

Go to Step 3

Go to Step 6

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, command the dash integration module (DIM) horn relay ON and OFF.

Do the horns operate?

Go to Step 5

Go to Step 4

4

Test the horn relay control circuit of the DIM for a poor connection or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

Go to Step 22

While observing the scan tool, activate the key fob panic feature.

Does the scan tool display the horn relay ON and OFF?

Go to Step 22

Go to Step 12

6

1. Turn OFF the ignition.
2. Disconnect the horn relay.
3. Connect a test lamp between the battery positive voltage circuit of the horn relay coil and ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 15

1. Connect a test lamp between the battery positive voltage circuit of the horn relay coil and the horn relay control circuit.
2. Depress and hold the horn switch.

Does the test lamp illuminate?

Go to Step 8

Go to Step 16

8

Connect a test lamp between the battery positive voltage circuit of the horn relay switch and ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 17

Momentarily connect a 15-amp fused jumper wire between the battery positive voltage circuit of the horn relay switch and the horn control circuit.

Do the horns operate?

Go to Step 13

Go to Step 10

1. Reconnect the horn relay.
2. Disconnect either horn connector.
3. Connect a test lamp between the horn control circuit and a good ground.
4. Depress and hold the horn switch.

Does the test lamp illuminate?

Go to Step 11

Go to Step 18

1. Connect a test lamp between the horn control circuit and the horn ground circuit.
2. Depress and hold the horn switch.

Does the test lamp illuminate?

Go to Step 14

Go to Step 19

Inspect for poor connections at the harness connector of the remote control door lock receiver (RCDLR) module. 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 23

Go to Step 20

Inspect for poor connections at the horn 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 23

Go to Step 21

14

Repair the high resistance in the horn control circuit or the horn ground circuit. A resistance as low as 0.5 ohms could cause operating problems with the horns. Also, though unlikely, it is possible on a dual horn system, that both horns are defective. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 23

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Repair the open or high resistance in the battery positive voltage circuit of the horn relay coil. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 23

--

16

Important:: The horn switch is part of the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.

1. To disable the SIR system, refer to SIR Disabling and Enabling in SIR.
2. Repair the open or short to battery positive voltage in the horn relay control circuit. The horn relay control circuit includes the horn switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 23

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Repair the open or high resistance in the battery positive voltage circuit of the horn relay switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 23

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Repair the open or high resistance in the horn control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 22

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Repair the open or high resistance in the horn ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 23

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Important: Perform the keyless entry transmitter programming procedure when replacing the RCDLR module.

Replace the RCDLR module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the repair?

Go to Go to Step 23

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Replace the horn relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 23

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Replace the DIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 23

Operate the horns.

Do the horns operate properly?

System OK

Go to Step 1