Step
| Action
| Value(s)
| Yes
| No
|
1
| Was the Park Brake System Check performed?
| --
|
Go to Step 2
| Go to
Park Brake System Check
|
2
| Attempt to release the park brake using the manual release.
Does the park brake release?
| --
|
Go to Step 3
|
Go to Step 4
|
3
|
- Turn the ignition switch to ON.
- Connect a scan tool to the data link connector (DLC) and turn
the ignition switch to ON.
- Establish communication with the rear integration module (RIM).
- Observe the Park Brake Switch status.
Is the Park Brake Switch status on?
| --
|
Go to Step 5
|
Go to Step 18
|
4
| Replace the park brake assembly. Refer to
Parking Brake Lever Pedal Assembly Replacement
.
Did you complete the replacement?
| --
|
Go to Step 29
| --
|
5
|
- Disconnect the park brake release solenoid connector.
- Connect a scan tool to the data link connector (DLC).
- Turn the ignition switch to ON.
- Establish communication with the rear integration module (RIM).
- Under special functions menu, select output control.
- Connect a DMM from park brake release solenoid connector terminal
B to ground.
- Using the scan tool, command the park brake relay B (park brake
release relay) on and off.
- Connect the DMM between park brake release solenoid connector
terminal A and ground.
- Using the scan tool, command the park brake relay A (park brake
ratchet relay) on and off.
Does the voltage measure near the specified value for both solenoid
A and solenoid B tests?
| Battery Positive Voltage (B+)
|
Go to Step 4
|
Go to Step 6
|
6
| In step 6, was
the voltage near the specified range for the test of solenoid A only?
| Battery Positive Voltage (B+)
|
Go to Step 13
|
Go to Step 12
|
7
|
- Remove park brake relay A from the rear fuse block.
- Connect a DMM from the rear fuse block connector C2 terminal B1
to battery positive voltage (B+).
- Using the scan tool as in step 6, command the park brake relay
A (park brake ratchet relay) on, then off.
Does the voltage change from 0 to 12 volts on command?
| --
|
Go to Step 10
|
Go to Step 8
|
8
| Check CKT 1607 (PNK) for an open or short to battery voltage.
Did you find and correct the condition?
| --
|
Go to Step 29
|
Go to Step 28
|
9
| Test the PRK/BRK voltage circuit for an open.
Did you find and correct the condition?
| --
|
Go to Step 29
| --
|
10
| Check for an open on CKT 1628
(BLK).
Did you find and correct the condition?
| --
|
Go to Step 29
|
Go to Step 11
|
11
|
- Check park brake relay A socket for poor terminal contact.
- If OK, replace the park brake relay A .
Did you complete the replacement?
| --
|
Go to Step 29
| --
|
12
| In step 6, was the voltage within
the specified range for the test of solenoid B only?
| Less than 0.5 V
|
Go to Step 7
|
Go to Step 22
|
13
|
- Remove park brake relay B from the rear fuse block.
- Connect a DMM from the rear fuse block connector C2 terminal B3
to battery positive voltage (B+).
- Using the scan tool as in step 6, command the park brake relay
B (park brake release relay) on, then off.
Does the voltage change from 0 to 12 volts on command?
| --
|
Go to Step 16
|
Go to Step 14
|
14
| Check CKT 1605 (LT GRN/BLK) for an open or short to battery voltage.
Did you find and correct the condition?
| --
|
Go to Step 29
|
Go to Step 28
|
15
| Measure voltage at PRK/BRK fuse cavity RA1.
Does the voltage measure near the specified range?
| Battery Positive
Voltage (B+)
|
Go to Step
28
|
Go to Step 9
|
16
| Check CKT 1627 (LT GRN) for an open.
Did you find and correct the condition?
| --
|
Go to Step 29
|
Go to Step 17
|
17
|
- Check park brake relay B socket for poor terminal contact.
- If OK, replace the park brake relay B.
Did you complete the replacement?
| --
|
Go to Step 29
| --
|
18
|
- Using the scan tool, establish communication with the instrument
cluster (IPC).
- From the data inputs menu, select park brake input.
- Momentarily connect a fused jumper from the park brake release
switch connector terminal A to ground, then disconnect the jumper.
Does the instrument cluster park brake input, as observed on the scan
tool, change state as the jumper is connected, and then removed?
| --
|
Go to Step
21
|
Go to Step 19
|
19
| Check CKT 1134 (LT BLU) for an open or short to ground.
Did you find and correct the condition?
| --
|
Go to Step 29
|
Go to Step 20
|
20
|
- Check for poor terminal contact at IPC cluster connector C2 terminal
B1.
- If OK, replace the IPC cluster.
Did you complete the replacement?
| --
|
Go to Step 29
| --
|
21
|
- Check for poor terminal contact at park brake release switch connector.
- If OK, replace park brake release switch.
Did you complete the replacement?
| --
|
Go to Step 29
| --
|
22
| Check PRK BRK fuse in rear fuse
block.
Is the fuse open?
| --
|
Go to Step 23
|
Go to Step 15
|
23
|
- Check for short at PRK BRK fuse within rear fuse block.
- If OK check CKT 1627 and CKT 1628 for short to ground.
Did you find and correct the condition?
| --
|
Go to Step 29
|
Go to Step 4
|
24
|
- Turn the ignition switch to OFF.
- Remove the PRK BRK fuse from the rear fuse block.
- Connect a DMM set to amps scale across the terminals of the removed
fuse.
- Connect a scan tool to the data link connector (DLC) and turn
the ignition switch to ON.
- Establish communication with the rear integration module (RIM).
- Under special functions menu, select output control.
- Using the scan tool, command the park brake relay A (park brake
release relay) on and off.
Does the current through the DMM change from high to low as the relay
cycles?
| --
|
Go to Step
13
|
Go to Step 5
|
25
| Using the scan tool, command the park brake relay B (park
brake ratchet eng relay) on and off.
Does the current through the DMM change from high to low as the relay
cycles?
| --
|
Go to Step
20
|
Go to Step 22
|
26
|
- Turn the ignition switch to ON.
- Without removing relays, using a DMM to ground, check for power
at park brake relay B terminal 86 and park brake relay A terminal 85.
Does the voltage measure near the specified range in both cases?
| Battery Positive Voltage (B+)
|
Go to Step 28
|
Go to Step 27
|
27
| Repair ignition circuit which
feeds the park brake relay coils. Refer to
Wiring Repairs
Did you complete the repair?
| --
|
Go to Step 29
| --
|
28
|
- Check rear integration module (RIM) connector C2 for poor terminal
contact.
- If OK, replace RIM. Refer
Rear Integration Body Control Module Replacement
Did you complete the replacement?
| --
|
Go to Step 29
| --
|
29
|
- Make sure any components removed during diagnosis are installed
in place and that all connectors are connected.
- Repeat the system check. Refer to
Park Brake System Check
Is the system check complete?
| --
| System OK
| --
|