Jeep Grand Cherokee WK. Manual — part 529
U0021-CAN B BUS (+) CIRCUIT OPEN
8N - 276
POWER SEATS - ELECTRICAL DIAGNOSTICS
WK
U0021-CAN B BUS (+) CIRCUIT OPEN (CONTINUED)
For the Power Seat System circuit diagram (Refer to 8 - ELECTRICAL/POWER SEATS - SCHEMATICS AND DIA-
GRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
The Memory Seat Module detects the (D55) CAN B Bus (+) circuit is open.
Possible Causes
(D55) CAN B BUS (+) CIRCUIT OPEN
MEMORY SEAT MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase MSM DTC’s
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active MSM DTC’s.
Does the scan tool display this DTC as active?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not present at this time. Using the wiring diagram/sche-
matic as a guide, inspect the wiring and connectors.
2.
(D55) CAN B BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the Memory Seat Module C1 harness connector.
Measure the voltage between the (D55) CAN B Bus (+) circuit and
ground.
Is there any voltage present?
Yes
>> Inspect the wiring and connectors for damage or shorted
circuits. If ok, replace the Memory Seat Module in accor-
dance with the service information.
Perform POWER SEAT SYSTEM VERIFICATION TEST -
VER 1.
No
>> Repair the (D55) CAN B Bus (+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
WK
POWER SEATS - ELECTRICAL DIAGNOSTICS
8N - 277
U0022-CAN B BUS (+) CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0023-CAN B BUS (+) CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
8N - 278
POWER SEATS - ELECTRICAL DIAGNOSTICS
WK
U0024-CAN B BUS (-) CIRCUIT OPEN
WK
POWER SEATS - ELECTRICAL DIAGNOSTICS
8N - 279
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