1. Set the ignition to LOCK.
2. Have an assistant check the pump.

Is the park brake pump motor running?

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Go to Step 2

Go to Step 7

Look at the instrument cluster.

Is the AUTO PARK lamp illuminated?

--

Go to Step 3

Go to Step 4

Repair the short to voltage in one of the following areas:

Is the repair complete?

--

System OK

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Disconnect the pump motor relay.

Is the pump still running?

--

Go to Step 5

Go to Step 6

Repair the short to B+ in CKT 1470 (ORN) wire between the park brake pump motor relay and the park brake pump motor.

Is the repair complete?

--

System OK

--

Replace the park brake pump motor relay. Refer to Park Brake Pressure Relay Replacement .

Is the repair complete?

--

System OK

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1. Make sure that the pull button switch is pushed in.
2. Make sure that the transmission range (TR) selector is in Park.
3. Turn the ignition to RUN.

Is the pump running?

--

Go to Step 3

Go to Step 8

Check the hydraulic fluid reservoir of the park brake pump.

Is the reservoir empty?

--

Go to Step 9

Go to Step 13

1. Fill the pump reservoir with Dextron III. Refer to Checking and Adding Park Brake Fluid .
2. With the ignition in RUN, move the TR selector out of Park.

Is there a visible leak when the pump is running?

--

Go to Step 10

Go to Step 11

Repair the leak found as required.

Is the repair complete?

--

System OK

--

Check the reservoir.

Is it empty again?

--

Go to Step 12

Go to Step 13

Replace the actuator assembly. Refer to Parking Brake Actuator Replacement .

Is the repair complete?

--

System OK

--

Disconnect the pump motor switch.

Is the pump still running?

Go to Step 3

Go to Step 14

Locate and replace the failed hydraulic component:

Is the repair complete?

--

System OK

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