DTC B0936 L61
Circuit Description
When engine coolant is at the proper level, the low coolant switch is closed.
When in this condition, battery voltage is applied to the low coolant 1478 input of
the body control module (BCM).
When coolant is below the proper level, the coolant switch opens. Because no
voltage is applied to circuit 1478, the BCM responds by sending a serial data message
to the instrument panel cluster to turn On the low coolant light.
The BCM has an internal timer, which will not turn On the low coolant telltale
unless the coolant level is low for greater than 30 seconds. The timer avoids coolant
"sloshing" falsely turning On the light.
Conditions for Running the DTC
| • | Ignition in RUN or CRANK position. |
| • | Low coolant condition (An open or short to ground on on circuit 1478 for
greater than 30 seconds) |
| • | Low coolant warning light always On with ignition in START. |
Diagnostic Aids
| • | Check for poor connection at BCM. Inspect harness connector for backed
out terminals, improper terminal mating, broken connector locks, improperly formed
or damaged terminals and poor terminal to wire connection (terminal crimped over wire
insulation and not conductors). |
| • | Inspect wiring harness for damage. Check for broken or chafed insulation. |
| • | Check for poor connection at the low coolant switch. |
| • | If fault is suspected to be intermittent, wiggling harness wiring may
help in locating fault. |
DTC B0936
DTC B0936 L81
Circuit Description
When engine coolant is at the proper level, the low coolant switch is closed.
When in this condition, battery voltage is applied to the low coolant 1478 input of
the body control module (BCM).
When coolant is below the proper level, the coolant switch opens. Because no
voltage is applied to circuit 1478, the BCM responds by sending a serial data message
to the instrument panel cluster to turn On the "LOW COOLANT" telltale.
The BCM has an internal timer, which will not turn On the low coolant telltale
unless the coolant level is low for greater than 30 seconds. The timer avoids coolant
"sloshing" falsely turning On the "LOW COOLANT" telltale.
Conditions for Running the DTC
| • | Ignition in RUN position. |
| • | Low coolant condition (No voltage on circuit 1478 for greater than 30 seconds) |
Diagnostic Aids
| • | Check for poor connection at BCM. Inspect harness connector for backed
out terminals, improper terminal mating, broken connector locks, improperly formed
or damaged terminals and poor terminal to wire connection (terminal crimped over wire
insulation and not conductors). |
| • | Inspect wiring harness for damage. Check for broken or chafed insulation. |
| • | Check for poor connection at the low coolant switch. |
| • | If fault is suspected to be intermittent, wiggling harness wiring may
help in locating fault. |
DTC B0936
