Step
| Action
| Value(s)
| Yes
| No
|
1
| Was the Park Brake System Check
performed?
| --
|
Go to Step 2
| Go to
Park Brake Diagnostic System Check
|
2
| Attempt to release the park brake using the manual release.
Does the park brake release?
| --
|
Go to Step
4
|
Go to Step 3
|
3
| Replace the park brake assembly. Refer to
Parking Brake Lever Pedal Assembly Replacement
.
Is the replacement complete?
| --
|
Go to Step
32
| --
|
4
|
- Turn the ignition switch to OFF.
- Remove the PRK BRK fuse from the rear junction 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
|
5
| 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 6
|
6
|
- 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.
Is the voltage within the specified range for both solenoid A and solenoid
B tests?
| Less than 0.5V
|
Go to Step 25
|
Go to Step 7
|
7
| In step 6, was the voltage within the specified range for the test of
solenoid A only?
| Less than 0.5V
|
Go to Step 8
|
Go to Step 14
|
8
|
- Remove park brake relay A from the rear junction block.
- Connect a DMM from the rear junction 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 11
|
Go to Step 9
|
9
| Check CKT 1607 (PNK) for an
open or short to battery voltage.
Is the circuit OK?
| --
|
Go to Step 31
|
Go to Step 10
|
10
| Repair CKT 1607 (PNK) for open or short to battery voltage.
Is the circuit repair complete?
| --
|
Go to Step
32
| --
|
11
|
- Turn ignition OFF.
- Install a known good relay in place of park brake relay A.
- Turn the ignition switch to ON.
- Connect a DMM from the park brake release solenoid terminal A
to ground.
- Using the scan tool as in Step 6, command park brake relay A on,
then off.
Does the voltage change from 0 to 12 volts on command?
| --
|
Go to Step 13
|
Go to Step 12
|
12
| Repair open on CKT 1628 (BLK).
Is the circuit repair complete?
| --
|
Go to Step
32
| --
|
13
|
- Check park brake relay A socket for poor terminal contact.
- If OK, the park brake relay A (replaced in step 11) is faulty.
Is the replacement complete?
| --
|
Go to Step
32
| --
|
14
| In step 6, was the voltage within the specified range for
the test of solenoid B only?
| Less than 0.5V
|
Go to Step
15
|
Go to Step 21
|
15
|
- Remove park brake relay B from the rear junction block.
- Connect a DMM from the rear junction 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 18
|
Go to Step 16
|
16
| Check CKT 1605 (LT GRN/BLK)
for an open or short to battery voltage.
Is the circuit OK?
| --
|
Go to Step 31
|
Go to Step 17
|
17
| Repair 1605 (LT GRN/BLK) for open or short to battery voltage.
Is the circuit repair complete?
| --
|
Go to Step
32
| --
|
18
|
- Turn ignition OFF.
- Install a known good relay in place of park brake relay B.
- Turn the ignition switch to ON.
- Connect a DMM from the park brake release solenoid terminal B
to ground.
- Using the scan tool as in step 6, command park brake relay B on,
then off.
Does the voltage change from 0 to 12 volts on command?
| --
|
Go to Step 20
|
Go to Step 19
|
19
| Repair open on CKT 1627 (LT
GRN).
Is the circuit repair complete?
| --
|
Go to Step
32
| --
|
20
|
- Check park brake relay B socket for poor terminal contact.
- If OK, the park brake relay B (replaced in step 18) is faulty.
Is the replacement complete?
| --
|
Go to Step
32
| --
|
21
|
- 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 cluster park brake input, as observed on the scan tool, switch
on and off as the jumper is connected, then removed?
| --
|
Go to Step 24
|
Go to Step
22
|
22
| Check CKT 1134 (LT BLU) for an open or short to ground.
Is the circuit OK?
| --
| Go to
Brake Warning System Check
in Hydraulic Brakes
|
Go to Step 23
|
23
| Repair CKT 1134 (LT BLU).
Is the circuit repair complete?
| --
|
Go to Step
32
| --
|
24
|
- Check for poor terminal contact at park brake release switch connector.
- If OK, replace park brake release switch.
Is the replacement complete?
| --
|
Go to Step
32
| --
|
25
| Check PRK BRK fuse in rear junction block.
Is the fuse open?
| --
|
Go to Step 26
|
Go to Step 29
|
26
| Check for short at PRK BRK fuse within rear junction block.
Is the circuit shorted?
| --
|
Go to Step
27
|
Go to Step 28
|
27
| Replace rear junction block.
Is the replacement complete?
| --
|
Go to Step
32
| --
|
28
| Replace PRK BRK fuse.
Is the replacement complete?
| --
|
Go to Step
32
| --
|
29
|
- 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.
Is the voltage within the specified range in both cases?
| 10-15V
|
Go to Step 31
|
Go to Step 30
|
30
| Repair ignition circuit which
feeds the park brake relay coils. Refer to Power Distribution Cell 10 in Wiring
Systems.
Is the repair complete?
| --
|
Go to Step
32
| --
|
31
|
- Check rear integration module (RIM) connector C2 for poor terminal
contact.
- If OK, replace RIM. Refer
Body Control Module Replacement
in Body Control System.
Is the replacement complete?
| --
|
Go to Step
32
| --
|
32
|
- 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 Diagnostic System Check
.
Is the system check complete?
| --
| System OK
| --
|
