1. Prepare the vehicle as follows:

•	Set the ignition switch to LOCK.

•	Set the TR control to Park.

2. Check the park brake pump.

Is the pump running constantly?

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Go to Step 2

Go to Step 7

Look at the instrument cluster.

Is the AUTO PARK light illuminated?

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Go to Step 3

Go to Step 4

Repair the short to voltage in Circuit 1929 (PNK/BLK) between the park brake pump motor relay terminal 86, the park brake pump motor switch terminal B, and splice S306.

Is the repair complete?

--

System OK

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Remove the park brake pump motor relay from its socket.

Does the motor stop running?

--

Go to Step 6

Go to Step 5

Repair the short to voltage in Circuit 1470 (ORN) between the park brake pump motor terminal A and the relay terminal 87.

Is the repair complete?

--

System OK

--

Replace the Park Brake Pump Motor Relay.

Is the repair complete?

--

System OK

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1. Turn the ignition switch to RUN.
2. Keep the TR control in Park.

Is the motor running constantly?

--

Go to Step 8

Go to Step 11

Remove the park brake pump motor relay from its socket.

Does the motor stop running?

--

Go to Step 9

Go to Step 10

Repair the short to voltage in Circuit 1929 (PNK/BLK) between the park brake pump motor relay terminal 86, the park brake pump motor switch terminal B, and splice S308.

Is the repair complete?

--

System OK

--

Repair the short to voltage in Circuit 1470 (ORN) between the park brake pump motor terminal A and the relay terminal 87.

Is the repair complete?

--

System OK

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1. If the motor is pulsing on and off rapidly, and the AUTO PARK indicator is flickering, the problem is a shorted diode 899 between splices S306 and S307.
2. Replace diode 899 with a new diode.

Is the repair complete?

--

System OK

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