Checking the signal cable

Fig 1: Identifying Ignition OFF

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Ignition off.
Connect an ohmmeter between air conditioning (A/C) relay base terminal #2 and ground.

Fig 2: Identifying Air Conditioning (A/C) Relay Terminals
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Fig 3: Identifying Ohmmeter
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The ohmmeter should read infinite resistance.

OK
Refer to Checking the air conditioning (A/C) relay
NOT OK
Refer to Checking the signal cable

Fig 1: Identifying Ignition OFF

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Ignition off.
Check the cable between air conditioning (A/C) system relay base terminal #2 and engine control module (ECM) connector terminal #68. Check for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Fig 2: Identifying Air Conditioning (A/C) Relay Connector Terminals
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Fig 3: Identifying Ohmmeter
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Fig 4: Identifying EMS2000
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Continue
Refer to Verification

Check the cable between air conditioning (A/C) system relay base terminal #2 and engine control module (ECM) connector terminal #68. Check for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Fig 1: Identifying Air Conditioning (A/C) Relay Terminals

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Fig 2: Identifying Ohmmeter

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Fig 3: Identifying EMS2000

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Continue
Refer to Verification

Remedy as necessary.

Fig 1: Identifying Air Conditioning (A/C) Relay Terminals

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Fig 2: Identifying Ohmmeter

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Fig 3: Identifying EMS2000

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Continue
Refer to Verification